composer libs minor version updates

82 files changed, 392 insertions, 667 deletions

diff --git a/vendor/sabre/dav/composer.json b/vendor/sabre/dav/composer.json
index 7c9596d21..5f0a44d66 100644
--- a/vendor/sabre/dav/composer.json
+++ b/vendor/sabre/dav/composer.json
@@ -29,7 +29,7 @@
         "ext-date" : "*",
         "ext-iconv" : "*",
         "lib-libxml" : ">=2.7.0",
-        "psr/log": "^1.0",
+        "psr/log": "^1.0 || ^2.0 || ^3.0",
         "ext-json": "*"
     },
     "require-dev" : {
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php b/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php
index 0d5df3968..2f48ab982 100644
--- a/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php
@@ -948,42 +948,46 @@ SQL;
         }
         list($calendarId, $instanceId) = $calendarId;
 
-        // Current synctoken
-        $stmt = $this->pdo->prepare('SELECT synctoken FROM '.$this->calendarTableName.' WHERE id = ?');
-        $stmt->execute([$calendarId]);
-        $currentToken = $stmt->fetchColumn(0);
-
-        if (is_null($currentToken)) {
-            return null;
-        }
-
         $result = [
-            'syncToken' => $currentToken,
             'added' => [],
             'modified' => [],
             'deleted' => [],
         ];
 
         if ($syncToken) {
-            $query = 'SELECT uri, operation FROM '.$this->calendarChangesTableName.' WHERE synctoken >= ? AND synctoken < ? AND calendarid = ? ORDER BY synctoken';
+            $query = 'SELECT uri, operation, synctoken FROM '.$this->calendarChangesTableName.' WHERE synctoken >= ?  AND calendarid = ? ORDER BY synctoken';
             if ($limit > 0) {
-                $query .= ' LIMIT '.(int) $limit;
+                // Fetch one more raw to detect result truncation
+                $query .= ' LIMIT '.((int) $limit + 1);
             }
 
             // Fetching all changes
             $stmt = $this->pdo->prepare($query);
-            $stmt->execute([$syncToken, $currentToken, $calendarId]);
+            $stmt->execute([$syncToken, $calendarId]);
 
             $changes = [];
 
             // This loop ensures that any duplicates are overwritten, only the
             // last change on a node is relevant.
             while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-                $changes[$row['uri']] = $row['operation'];
+                $changes[$row['uri']] = $row;
             }
+            $currentToken = null;
 
+            $result_count = 0;
             foreach ($changes as $uri => $operation) {
-                switch ($operation) {
+                if (!is_null($limit) && $result_count >= $limit) {
+                    $result['result_truncated'] = true;
+                    break;
+                }
+
+                if (null === $currentToken || $currentToken < $operation['synctoken'] + 1) {
+                    // SyncToken in CalDAV perspective is consistently the next number of the last synced change event in this class.
+                    $currentToken = $operation['synctoken'] + 1;
+                }
+
+                ++$result_count;
+                switch ($operation['operation']) {
                     case 1:
                         $result['added'][] = $uri;
                         break;
@@ -995,7 +999,24 @@ SQL;
                         break;
                 }
             }
+
+            if (!is_null($currentToken)) {
+                $result['syncToken'] = $currentToken;
+            } else {
+                // This means returned value is equivalent to syncToken
+                $result['syncToken'] = $syncToken;
+            }
         } else {
+            // Current synctoken
+            $stmt = $this->pdo->prepare('SELECT synctoken FROM '.$this->calendarTableName.' WHERE id = ?');
+            $stmt->execute([$calendarId]);
+            $currentToken = $stmt->fetchColumn(0);
+
+            if (is_null($currentToken)) {
+                return null;
+            }
+            $result['syncToken'] = $currentToken;
+
             // No synctoken supplied, this is the initial sync.
             $query = 'SELECT uri FROM '.$this->calendarObjectTableName.' WHERE calendarid = ?';
             $stmt = $this->pdo->prepare($query);
diff --git a/vendor/sabre/dav/lib/CalDAV/Calendar.php b/vendor/sabre/dav/lib/CalDAV/Calendar.php
index 9f32e702a..6e989314d 100644
--- a/vendor/sabre/dav/lib/CalDAV/Calendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/Calendar.php
@@ -396,7 +396,8 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      *   'deleted' => [
      *      'foo.php.bak',
      *      'old.txt'
-     *   ]
+     *   ],
+     *   'result_truncated' : true
      * ];
      *
      * The syncToken property should reflect the *current* syncToken of the
@@ -406,6 +407,9 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      * If the syncToken is specified as null, this is an initial sync, and all
      * members should be reported.
      *
+     * If result is truncated due to server limitation or limit by client,
+     * set result_truncated to true, otherwise set to false or do not add the key.
+     *
      * The modified property is an array of nodenames that have changed since
      * the last token.
      *
@@ -422,12 +426,17 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      * should be treated as infinite.
      *
      * If the limit (infinite or not) is higher than you're willing to return,
-     * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
+     * the result should be truncated to fit the limit.
+     * Note that even when the result is truncated, syncToken must be consistent
+     * with the truncated result, not the result before truncation.
+     * (See RFC6578 Section 3.6 for detail)
      *
      * If the syncToken is expired (due to data cleanup) or unknown, you must
      * return null.
      *
      * The limit is 'suggestive'. You are free to ignore it.
+     * TODO: RFC6578 Setion 3.7 says that the server must fail when the server
+     * cannot truncate according to the limit, so it may not be just suggestive.
      *
      * @param string $syncToken
      * @param int    $syncLevel
diff --git a/vendor/sabre/dav/lib/CalDAV/Plugin.php b/vendor/sabre/dav/lib/CalDAV/Plugin.php
index da172049e..98f4f554c 100644
--- a/vendor/sabre/dav/lib/CalDAV/Plugin.php
+++ b/vendor/sabre/dav/lib/CalDAV/Plugin.php
@@ -243,7 +243,7 @@ class Plugin extends DAV\ServerPlugin
      * @param mixed  $report
      * @param mixed  $path
      *
-     * @return bool
+     * @return bool|null
      */
     public function report($reportName, $report, $path)
     {
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php b/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php
index 38a7ca96f..3cc360f1d 100644
--- a/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php
@@ -735,9 +735,7 @@ class Plugin extends ServerPlugin
 
     /**
      * This method is responsible for parsing a free-busy query request and
-     * returning it's result.
-     *
-     * @return string
+     * returning its result in $response.
      */
     protected function handleFreeBusyRequest(IOutbox $outbox, VObject\Component $vObject, RequestInterface $request, ResponseInterface $response)
     {
diff --git a/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php b/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php
index 3be1b609e..8d56e6441 100644
--- a/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php
+++ b/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php
@@ -75,7 +75,7 @@ class Subscription extends Collection implements ISubscription, IACL
     /**
      * Returns the last modification time.
      *
-     * @return int
+     * @return int|null
      */
     public function getLastModified()
     {
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Plugin.php b/vendor/sabre/dav/lib/DAV/Auth/Plugin.php
index 68adbede5..eb4f27ca6 100644
--- a/vendor/sabre/dav/lib/DAV/Auth/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Plugin.php
@@ -113,8 +113,6 @@ class Plugin extends ServerPlugin
 
     /**
      * This method is called before any HTTP method and forces users to be authenticated.
-     *
-     * @return bool
      */
     public function beforeMethod(RequestInterface $request, ResponseInterface $response)
     {
@@ -204,8 +202,6 @@ class Plugin extends ServerPlugin
      * This method will for example cause a HTTP Basic backend to set a
      * WWW-Authorization header, indicating to the client that it should
      * authenticate.
-     *
-     * @return array
      */
     public function challenge(RequestInterface $request, ResponseInterface $response)
     {
diff --git a/vendor/sabre/dav/lib/DAV/Browser/Plugin.php b/vendor/sabre/dav/lib/DAV/Browser/Plugin.php
index 2f155d9ea..89495e5db 100644
--- a/vendor/sabre/dav/lib/DAV/Browser/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Browser/Plugin.php
@@ -85,8 +85,6 @@ class Plugin extends DAV\ServerPlugin
     /**
      * This method intercepts GET requests that have ?sabreAction=info
      * appended to the URL.
-     *
-     * @return bool
      */
     public function httpGetEarly(RequestInterface $request, ResponseInterface $response)
     {
diff --git a/vendor/sabre/dav/lib/DAV/Locks/Plugin.php b/vendor/sabre/dav/lib/DAV/Locks/Plugin.php
index 110bfce06..2443f204c 100644
--- a/vendor/sabre/dav/lib/DAV/Locks/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/Plugin.php
@@ -295,6 +295,10 @@ class Plugin extends DAV\ServerPlugin
     {
         $locks = $this->getLocks($path, $includeChildren = true);
         foreach ($locks as $lock) {
+            // don't delete a lock on a parent dir
+            if (0 !== strpos($lock->uri, $path)) {
+                continue;
+            }
             $this->unlockNode($path, $lock);
         }
     }
diff --git a/vendor/sabre/dav/lib/DAV/Server.php b/vendor/sabre/dav/lib/DAV/Server.php
index de663d0c1..1f8300d4a 100644
--- a/vendor/sabre/dav/lib/DAV/Server.php
+++ b/vendor/sabre/dav/lib/DAV/Server.php
@@ -895,7 +895,7 @@ class Server implements LoggerAwareInterface, EmitterInterface
         }
 
         $propertyNames = $propFind->getRequestedProperties();
-        $propFindType = !empty($propertyNames) ? PropFind::NORMAL : PropFind::ALLPROPS;
+        $propFindType = !$propFind->isAllProps() ? PropFind::NORMAL : PropFind::ALLPROPS;
 
         foreach ($this->tree->getChildren($path) as $childNode) {
             if ('' !== $path) {
@@ -1237,6 +1237,7 @@ class Server implements LoggerAwareInterface, EmitterInterface
 
         $this->tree->markDirty($parentUri);
         $this->emit('afterBind', [$uri]);
+        $this->emit('afterCreateCollection', [$uri]);
     }
 
     /**
diff --git a/vendor/sabre/dav/lib/DAV/Sync/Plugin.php b/vendor/sabre/dav/lib/DAV/Sync/Plugin.php
index 32106abb3..8609f759e 100644
--- a/vendor/sabre/dav/lib/DAV/Sync/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Sync/Plugin.php
@@ -124,6 +124,10 @@ class Plugin extends DAV\ServerPlugin
             throw new DAV\Exception\InvalidSyncToken('Invalid or unknown sync token');
         }
 
+        if (!array_key_exists('result_truncated', $changeInfo)) {
+            $changeInfo['result_truncated'] = false;
+        }
+
         // Encoding the response
         $this->sendSyncCollectionResponse(
             $changeInfo['syncToken'],
@@ -131,7 +135,8 @@ class Plugin extends DAV\ServerPlugin
             $changeInfo['added'],
             $changeInfo['modified'],
             $changeInfo['deleted'],
-            $report->properties
+            $report->properties,
+            $changeInfo['result_truncated']
         );
     }
 
@@ -141,7 +146,7 @@ class Plugin extends DAV\ServerPlugin
      * @param string $syncToken
      * @param string $collectionUrl
      */
-    protected function sendSyncCollectionResponse($syncToken, $collectionUrl, array $added, array $modified, array $deleted, array $properties)
+    protected function sendSyncCollectionResponse($syncToken, $collectionUrl, array $added, array $modified, array $deleted, array $properties, bool $resultTruncated = false)
     {
         $fullPaths = [];
 
@@ -164,6 +169,10 @@ class Plugin extends DAV\ServerPlugin
             $fullPath = $collectionUrl.'/'.$item;
             $responses[] = new DAV\Xml\Element\Response($fullPath, [], 404);
         }
+        if ($resultTruncated) {
+            $responses[] = new DAV\Xml\Element\Response($collectionUrl.'/', [], 507);
+        }
+
         $multiStatus = new DAV\Xml\Response\MultiStatus($responses, self::SYNCTOKEN_PREFIX.$syncToken);
 
         $this->server->httpResponse->setStatus(207);
diff --git a/vendor/sabre/dav/lib/DAV/Tree.php b/vendor/sabre/dav/lib/DAV/Tree.php
index 2417979a6..8215e2c39 100644
--- a/vendor/sabre/dav/lib/DAV/Tree.php
+++ b/vendor/sabre/dav/lib/DAV/Tree.php
@@ -226,7 +226,7 @@ class Tree
         // flushing the entire cache
         $path = trim($path, '/');
         foreach ($this->cache as $nodePath => $node) {
-            if ('' === $path || $nodePath == $path || 0 === strpos($nodePath, $path.'/')) {
+            if ('' === $path || $nodePath == $path || 0 === strpos((string) $nodePath, $path.'/')) {
                 unset($this->cache[$nodePath]);
             }
         }
diff --git a/vendor/sabre/dav/lib/DAV/Version.php b/vendor/sabre/dav/lib/DAV/Version.php
index b25d6c07a..f8b56bb98 100644
--- a/vendor/sabre/dav/lib/DAV/Version.php
+++ b/vendor/sabre/dav/lib/DAV/Version.php
@@ -16,5 +16,5 @@ class Version
     /**
      * Full version number.
      */
-    public const VERSION = '4.1.5';
+    public const VERSION = '4.3.1';
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Element/Response.php b/vendor/sabre/dav/lib/DAV/Xml/Element/Response.php
index 45c161fa4..79f06a09b 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Element/Response.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Element/Response.php
@@ -121,7 +121,7 @@ class Response implements Element
 
         foreach ($this->getResponseProperties() as $status => $properties) {
             // Skipping empty lists
-            if (!$properties || (!ctype_digit($status) && !is_int($status))) {
+            if (!$properties || (!is_int($status) && !ctype_digit($status))) {
                 continue;
             }
             $empty = false;
@@ -186,8 +186,21 @@ class Response implements Element
 
                 return [];
             }
+
+            if (!$reader->read()) {
+                $reader->next();
+
+                return [];
+            }
+
+            if (Reader::END_ELEMENT === $reader->nodeType) {
+                $reader->next();
+
+                return [];
+            }
+
             $values = [];
-            $reader->read();
+
             do {
                 if (Reader::ELEMENT === $reader->nodeType) {
                     $clark = $reader->getClark();
@@ -199,9 +212,12 @@ class Response implements Element
                         $values[$clark] = $reader->parseCurrentElement()['value'];
                     }
                 } else {
-                    $reader->read();
+                    if (!$reader->read()) {
+                        break;
+                    }
                 }
             } while (Reader::END_ELEMENT !== $reader->nodeType);
+
             $reader->read();
 
             return $values;
diff --git a/vendor/sabre/dav/lib/DAVACL/Plugin.php b/vendor/sabre/dav/lib/DAVACL/Plugin.php
index 6f071927d..46d680e15 100644
--- a/vendor/sabre/dav/lib/DAVACL/Plugin.php
+++ b/vendor/sabre/dav/lib/DAVACL/Plugin.php
@@ -927,8 +927,6 @@ class Plugin extends DAV\ServerPlugin
      * Triggered before properties are looked up in specific nodes.
      *
      * @TODO really should be broken into multiple methods, or even a class.
-     *
-     * @return bool
      */
     public function propFind(DAV\PropFind $propFind, DAV\INode $node)
     {
@@ -1070,8 +1068,6 @@ class Plugin extends DAV\ServerPlugin
      * @param string $reportName
      * @param mixed  $report
      * @param mixed  $path
-     *
-     * @return bool
      */
     public function report($reportName, $report, $path)
     {
diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php
index 03a9c4bad..f61a0c953 100644
--- a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php
@@ -33,7 +33,7 @@ abstract class AbstractBackend implements BackendInterface
      * @param string $uri
      * @param string $principalPrefix
      *
-     * @return string
+     * @return string|null
      */
     public function findByUri($uri, $principalPrefix)
     {
diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php
index 72717a59b..7140a9295 100644
--- a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php
@@ -110,7 +110,7 @@ interface BackendInterface
      * @param string $uri
      * @param string $principalPrefix
      *
-     * @return string
+     * @return string|null
      */
     public function findByUri($uri, $principalPrefix);
 
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Property/Principal.php b/vendor/sabre/dav/lib/DAVACL/Xml/Property/Principal.php
index 24aeffad9..52092128f 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Property/Principal.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/Principal.php
@@ -142,6 +142,8 @@ class Principal extends DAV\Xml\Property\Href
             case self::ALL:
                 return '<em>all</em>';
         }
+
+        return '<em>unknown</em>';
     }
 
     /**
diff --git a/vendor/sabre/event/composer.json b/vendor/sabre/event/composer.json
index 181afe190..42fb4aa22 100644
--- a/vendor/sabre/event/composer.json
+++ b/vendor/sabre/event/composer.json
@@ -46,7 +46,7 @@
         }
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "~2.16.1",
+        "friendsofphp/php-cs-fixer": "~2.17.1",
         "phpstan/phpstan": "^0.12",
         "phpunit/phpunit" : "^7.5 || ^8.5 || ^9.0"
     },
diff --git a/vendor/sabre/event/lib/EventEmitter.php b/vendor/sabre/event/lib/EventEmitter.php
index 18971e3ee..865c99b53 100644
--- a/vendor/sabre/event/lib/EventEmitter.php
+++ b/vendor/sabre/event/lib/EventEmitter.php
@@ -7,7 +7,7 @@ namespace Sabre\Event;
 /**
  * This is the old name for the Emitter class.
  *
- * Instead of of using EventEmitter, please use Emitter. They are identical
+ * Instead of using EventEmitter, please use Emitter. They are identical
  * otherwise.
  *
  * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
diff --git a/vendor/sabre/event/lib/Loop/Loop.php b/vendor/sabre/event/lib/Loop/Loop.php
index ec09be921..b85a7a440 100644
--- a/vendor/sabre/event/lib/Loop/Loop.php
+++ b/vendor/sabre/event/lib/Loop/Loop.php
@@ -273,7 +273,9 @@ class Loop
             $read = $this->readStreams;
             $write = $this->writeStreams;
             $except = null;
-            if (stream_select($read, $write, $except, (null === $timeout) ? null : 0, $timeout ? (int) ($timeout * 1000000) : 0)) {
+            // stream_select changes behavior in 8.1 to forbid passing non-null microseconds when the seconds are null.
+            // Older versions of php don't allow passing null to microseconds.
+            if (null !== $timeout ? stream_select($read, $write, $except, 0, (int) ($timeout * 1000000)) : stream_select($read, $write, $except, null)) {
                 // See PHP Bug https://bugs.php.net/bug.php?id=62452
                 // Fixed in PHP7
                 foreach ($read as $readStream) {
diff --git a/vendor/sabre/event/lib/Promise.php b/vendor/sabre/event/lib/Promise.php
index 1228561af..42969a55f 100644
--- a/vendor/sabre/event/lib/Promise.php
+++ b/vendor/sabre/event/lib/Promise.php
@@ -144,7 +144,7 @@ class Promise
     }
 
     /**
-     * Marks this promise as rejected, and set it's rejection reason.
+     * Marks this promise as rejected, and set its rejection reason.
      */
     public function reject(Throwable $reason)
     {
diff --git a/vendor/sabre/event/lib/Promise/functions.php b/vendor/sabre/event/lib/Promise/functions.php
index 986fe2b00..fbed63471 100644
--- a/vendor/sabre/event/lib/Promise/functions.php
+++ b/vendor/sabre/event/lib/Promise/functions.php
@@ -18,7 +18,7 @@ use Throwable;
 
 /**
  * This function takes an array of Promises, and returns a Promise that
- * resolves when all of the given arguments have resolved.
+ * resolves when all the given arguments have resolved.
  *
  * The returned Promise will resolve with a value that's an array of all the
  * values the given promises have been resolved with.
diff --git a/vendor/sabre/event/lib/Version.php b/vendor/sabre/event/lib/Version.php
index 457aea9b2..fe8f5c3bf 100644
--- a/vendor/sabre/event/lib/Version.php
+++ b/vendor/sabre/event/lib/Version.php
@@ -16,5 +16,5 @@ class Version
     /**
      * Full version number.
      */
-    const VERSION = '5.1.2';
+    const VERSION = '5.1.4';
 }
diff --git a/vendor/sabre/event/lib/WildcardEmitter.php b/vendor/sabre/event/lib/WildcardEmitter.php
index 1b7c248b2..997709e8a 100644
--- a/vendor/sabre/event/lib/WildcardEmitter.php
+++ b/vendor/sabre/event/lib/WildcardEmitter.php
@@ -22,9 +22,9 @@ namespace Sabre\Event;
  * - Using ":" as a separator is optional, but it's highly recommended to use
  *   some kind of separator.
  *
- * The WilcardEmitter is a bit slower than the regular Emitter. If you code
+ * The WildcardEmitter is a bit slower than the regular Emitter. If your code
  * must be very high performance, it might be better to try to use the other
- * emitter. For must usage the difference is negligible though.
+ * emitter. For most usage the difference is negligible though.
  *
  * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
diff --git a/vendor/sabre/http/.travis.yml b/vendor/sabre/http/.travis.yml
deleted file mode 100644
index c93e4ae75..000000000
--- a/vendor/sabre/http/.travis.yml
+++ /dev/null
@@ -1,51 +0,0 @@
-language: php
-sudo: required
-php:
-  - 7.1
-  - 7.2
-  - 7.3
-  - 7.4
-
-env:
-  global:
-    - RUN_PHPCSFIXER="TRUE"
-    - RUN_PHPUNIT="TRUE"
-    - RUN_PHPSTAN="FALSE"
-  matrix:
-    - PREFER_LOWEST="" REPORT_COVERAGE="TRUE" WITH_COVERAGE="--coverage-clover=coverage.xml"
-    - PREFER_LOWEST="--prefer-lowest" REPORT_COVERAGE="FALSE" WITH_COVERAGE=""
-
-matrix:
-  include:
-    - name: 'PHP8'
-      dist: focal
-      php: nightly
-      env:
-        - RUN_PHPCSFIXER="FALSE"
-        - REPORT_COVERAGE="FALSE"
-    - name: 'PHPStan'
-      php: 7.4
-      env:
-        - RUN_PHPCSFIXER="FALSE"
-        - RUN_PHPUNIT="FALSE"
-        - RUN_PHPSTAN="TRUE"
-        - REPORT_COVERAGE="FALSE"
-  fast_finish: true
-
-cache:
-    directories:
-        - $HOME/.composer/cache
-
-before_script:
-  - if [ $RUN_PHPCSFIXER == "FALSE" ]; then composer remove --dev friendsofphp/php-cs-fixer; fi
-  - composer update $PREFER_LOWEST
-  - PHP_BIN=$(phpenv which php)
-  - sudo $PHP_BIN -S localhost:80 -t $TRAVIS_BUILD_DIR/tests/www 2>/dev/null &
-
-script:
-  - if [ $RUN_PHPCSFIXER == "TRUE" ]; then php vendor/bin/php-cs-fixer fix --dry-run --diff; fi
-  - if [ $RUN_PHPUNIT == "TRUE" ]; then php vendor/bin/phpunit --configuration tests/phpunit.xml $WITH_COVERAGE; fi
-  - if [ $RUN_PHPSTAN == "TRUE" ]; then composer phpstan; fi
-
-after_success:
-  - if [ $REPORT_COVERAGE == "TRUE" ]; then bash <(curl -s https://codecov.io/bash); fi
diff --git a/vendor/sabre/http/CHANGELOG.md b/vendor/sabre/http/CHANGELOG.md
index eb226f7a5..4db8cc772 100644
--- a/vendor/sabre/http/CHANGELOG.md
+++ b/vendor/sabre/http/CHANGELOG.md
@@ -1,6 +1,18 @@
 ChangeLog
 =========
 
+5.1.3 (2021-11-04)
+------------------
+
+* #179 version bump that was missed in 5.1.2 (@phil-davis)
+
+5.1.2 (2021-11-04)
+-------------------------
+
+* #169 Ensure $_SERVER keys are read as strings (@fredrik-eriksson)
+* #170 Fix deprecated usages on PHP 8.1 (@cedric-anne)
+* #175 Add resource size to CURL options in client (from #172 ) (@Dartui)
+
 5.1.1 (2020-10-03)
 -------------------------
 
diff --git a/vendor/sabre/http/composer.json b/vendor/sabre/http/composer.json
index 7f54df6e8..353646a28 100644
--- a/vendor/sabre/http/composer.json
+++ b/vendor/sabre/http/composer.json
@@ -13,7 +13,7 @@
         "sabre/uri"    : "^2.0"
     },
     "require-dev" : {
-        "friendsofphp/php-cs-fixer": "~2.16.1",
+        "friendsofphp/php-cs-fixer": "~2.17.1",
         "phpstan/phpstan": "^0.12",
         "phpunit/phpunit" : "^7.5 || ^8.5 || ^9.0"
     },
diff --git a/vendor/sabre/http/lib/Client.php b/vendor/sabre/http/lib/Client.php
index b79c564da..99ffcf8cb 100644
--- a/vendor/sabre/http/lib/Client.php
+++ b/vendor/sabre/http/lib/Client.php
@@ -376,11 +376,16 @@ class Client extends EventEmitter
             default:
                 $body = $request->getBody();
                 if (is_resource($body)) {
+                    $bodyStat = fstat($body);
+
                     // This needs to be set to PUT, regardless of the actual
                     // method used. Without it, INFILE will be ignored for some
                     // reason.
                     $settings[CURLOPT_PUT] = true;
-                    $settings[CURLOPT_INFILE] = $request->getBody();
+                    $settings[CURLOPT_INFILE] = $body;
+                    if (false !== $bodyStat && array_key_exists('size', $bodyStat)) {
+                        $settings[CURLOPT_INFILESIZE] = $bodyStat['size'];
+                    }
                 } else {
                     // For security we cast this to a string. If somehow an array could
                     // be passed here, it would be possible for an attacker to use @ to
diff --git a/vendor/sabre/http/lib/Message.php b/vendor/sabre/http/lib/Message.php
index 90153fda5..6474f38d2 100644
--- a/vendor/sabre/http/lib/Message.php
+++ b/vendor/sabre/http/lib/Message.php
@@ -88,7 +88,7 @@ abstract class Message implements MessageInterface
          * @var string|int|null
          */
         $contentLength = $this->getHeader('Content-Length');
-        if (is_int($contentLength) || ctype_digit($contentLength)) {
+        if (null !== $contentLength && (is_int($contentLength) || ctype_digit($contentLength))) {
             return stream_get_contents($body, (int) $contentLength);
         }
 
diff --git a/vendor/sabre/http/lib/Response.php b/vendor/sabre/http/lib/Response.php
index 64dfbc0b2..2369bb41e 100644
--- a/vendor/sabre/http/lib/Response.php
+++ b/vendor/sabre/http/lib/Response.php
@@ -149,7 +149,7 @@ class Response extends Message implements ResponseInterface
      */
     public function setStatus($status)
     {
-        if (ctype_digit($status) || is_int($status)) {
+        if (is_int($status) || ctype_digit($status)) {
             $statusCode = $status;
             $statusText = self::$statusCodes[$status] ?? 'Unknown';
         } else {
diff --git a/vendor/sabre/http/lib/Sapi.php b/vendor/sabre/http/lib/Sapi.php
index 73674a5a1..823d5df25 100644
--- a/vendor/sabre/http/lib/Sapi.php
+++ b/vendor/sabre/http/lib/Sapi.php
@@ -154,6 +154,7 @@ class Sapi
         $hostName = 'localhost';
 
         foreach ($serverArray as $key => $value) {
+            $key = (string) $key;
             switch ($key) {
                 case 'SERVER_PROTOCOL':
                     if ('HTTP/1.0' === $value) {
diff --git a/vendor/sabre/http/lib/Version.php b/vendor/sabre/http/lib/Version.php
index 624e2a78e..f182979c6 100644
--- a/vendor/sabre/http/lib/Version.php
+++ b/vendor/sabre/http/lib/Version.php
@@ -16,5 +16,5 @@ class Version
     /**
      * Full version number.
      */
-    const VERSION = '5.1.1';
+    const VERSION = '5.1.3';
 }
diff --git a/vendor/sabre/http/lib/functions.php b/vendor/sabre/http/lib/functions.php
index a23840a1a..97673da46 100644
--- a/vendor/sabre/http/lib/functions.php
+++ b/vendor/sabre/http/lib/functions.php
@@ -331,8 +331,8 @@ function parseMimeType(string $str): array
     if (2 !== count($mimeType)) {
         // Illegal value
         var_dump($mimeType);
-        die();
-        throw new InvalidArgumentException('Not a valid mime-type: '.$str);
+        exit();
+        // throw new InvalidArgumentException('Not a valid mime-type: '.$str);
     }
     list($type, $subType) = $mimeType;
 
diff --git a/vendor/sabre/uri/composer.json b/vendor/sabre/uri/composer.json
index 4a68797a5..d58fd51f7 100644
--- a/vendor/sabre/uri/composer.json
+++ b/vendor/sabre/uri/composer.json
@@ -37,7 +37,7 @@
         }
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "~2.16.1",
+        "friendsofphp/php-cs-fixer": "~2.17.1",
         "phpstan/phpstan": "^0.12",
         "phpunit/phpunit" : "^7.5 || ^8.5 || ^9.0"
     },
diff --git a/vendor/sabre/uri/lib/Version.php b/vendor/sabre/uri/lib/Version.php
index 4a6c58405..4527a0d8a 100644
--- a/vendor/sabre/uri/lib/Version.php
+++ b/vendor/sabre/uri/lib/Version.php
@@ -16,5 +16,5 @@ class Version
     /**
      * Full version number.
      */
-    const VERSION = '2.2.1';
+    const VERSION = '2.2.2';
 }
diff --git a/vendor/sabre/uri/lib/functions.php b/vendor/sabre/uri/lib/functions.php
index 0d64cead0..18a324337 100644
--- a/vendor/sabre/uri/lib/functions.php
+++ b/vendor/sabre/uri/lib/functions.php
@@ -84,7 +84,7 @@ function resolve(string $basePath, string $newPath): string
     $path = implode('/', $newPathParts);
 
     // If the source url ended with a /, we want to preserve that.
-    $newParts['path'] = $path;
+    $newParts['path'] = 0 === strpos($path, '/') ? $path : '/'.$path;
     if ($delta['query']) {
         $newParts['query'] = $delta['query'];
     } elseif (!empty($base['query']) && empty($delta['host']) && empty($delta['path'])) {
@@ -214,7 +214,7 @@ function parse(string $uri): array
  * This function takes the components returned from PHP's parse_url, and uses
  * it to generate a new uri.
  *
- * @param array<string, int|string> $parts
+ * @param array<string, int|string|null> $parts
  */
 function build(array $parts): string
 {
@@ -261,7 +261,7 @@ function build(array $parts): string
  * is used) and we need a method that just operates on UTF-8 characters.
  *
  * In addition basename and dirname are platform aware, and will treat
- * backslash (\) as a directory separator on windows.
+ * backslash (\) as a directory separator on Windows.
  *
  * This method returns the 2 components as an array.
  *
diff --git a/vendor/sabre/vobject/README.md b/vendor/sabre/vobject/README.md
index 5030cf276..659e3fa83 100644
--- a/vendor/sabre/vobject/README.md
+++ b/vendor/sabre/vobject/README.md
@@ -4,7 +4,7 @@ sabre/vobject
 The VObject library allows you to easily parse and manipulate [iCalendar](https://tools.ietf.org/html/rfc5545)
 and [vCard](https://tools.ietf.org/html/rfc6350) objects using PHP.
 
-The goal of the VObject library is to create a very complete library, with an easy to use API.
+The goal of the VObject library is to create a very complete library, with an easy-to-use API.
 
 
 Installation
diff --git a/vendor/sabre/vobject/lib/Cli.php b/vendor/sabre/vobject/lib/Cli.php
index 4984ac9b2..816e2cb31 100644
--- a/vendor/sabre/vobject/lib/Cli.php
+++ b/vendor/sabre/vobject/lib/Cli.php
@@ -453,8 +453,6 @@ HELP
      * Colorizes a file.
      *
      * @param Component $vObj
-     *
-     * @return int
      */
     protected function color($vObj)
     {
diff --git a/vendor/sabre/vobject/lib/Component.php b/vendor/sabre/vobject/lib/Component.php
index 07f6a627f..f33b628a7 100644
--- a/vendor/sabre/vobject/lib/Component.php
+++ b/vendor/sabre/vobject/lib/Component.php
@@ -339,6 +339,7 @@ class Component extends Node
      *
      * @return array
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         $components = [];
diff --git a/vendor/sabre/vobject/lib/Component/VCard.php b/vendor/sabre/vobject/lib/Component/VCard.php
index 2430df621..eac789842 100644
--- a/vendor/sabre/vobject/lib/Component/VCard.php
+++ b/vendor/sabre/vobject/lib/Component/VCard.php
@@ -445,6 +445,7 @@ class VCard extends VObject\Document
      *
      * @return array
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         // A vcard does not have sub-components, so we're overriding this
diff --git a/vendor/sabre/vobject/lib/ElementList.php b/vendor/sabre/vobject/lib/ElementList.php
index 56058cbd5..860512649 100644
--- a/vendor/sabre/vobject/lib/ElementList.php
+++ b/vendor/sabre/vobject/lib/ElementList.php
@@ -25,6 +25,7 @@ class ElementList extends ArrayIterator
      * @param int   $offset
      * @param mixed $value
      */
+    #[\ReturnTypeWillChange]
     public function offsetSet($offset, $value)
     {
         throw new LogicException('You can not add new objects to an ElementList');
@@ -37,6 +38,7 @@ class ElementList extends ArrayIterator
      *
      * @param int $offset
      */
+    #[\ReturnTypeWillChange]
     public function offsetUnset($offset)
     {
         throw new LogicException('You can not remove objects from an ElementList');
diff --git a/vendor/sabre/vobject/lib/ITip/Broker.php b/vendor/sabre/vobject/lib/ITip/Broker.php
index 4e0368e13..b66a59f54 100644
--- a/vendor/sabre/vobject/lib/ITip/Broker.php
+++ b/vendor/sabre/vobject/lib/ITip/Broker.php
@@ -547,9 +547,13 @@ class Broker
                 // properties changed in the event, or simply if there's a
                 // difference in instances that the attendee is invited to.
 
+                $oldAttendeeInstances = array_keys($attendee['oldInstances']);
+                $newAttendeeInstances = array_keys($attendee['newInstances']);
+
                 $message->significantChange =
                     'REQUEST' === $attendee['forceSend'] ||
-                    array_keys($attendee['oldInstances']) != array_keys($attendee['newInstances']) ||
+                    count($oldAttendeeInstances) != count($newAttendeeInstances) ||
+                    count(array_diff($oldAttendeeInstances, $newAttendeeInstances)) > 0 ||
                     $oldEventInfo['significantChangeHash'] !== $eventInfo['significantChangeHash'];
 
                 foreach ($attendee['newInstances'] as $instanceId => $instanceInfo) {
@@ -816,7 +820,10 @@ class Broker
         $instances = [];
         $exdate = [];
 
+        $significantChangeEventProperties = [];
+
         foreach ($calendar->VEVENT as $vevent) {
+            $eventSignificantChangeHash = '';
             $rrule = [];
 
             if (is_null($uid)) {
@@ -930,19 +937,26 @@ class Broker
                 if (isset($vevent->$prop)) {
                     $propertyValues = $vevent->select($prop);
 
-                    $significantChangeHash .= $prop.':';
+                    $eventSignificantChangeHash .= $prop.':';
 
                     if ('EXDATE' === $prop) {
-                        $significantChangeHash .= implode(',', $exdate).';';
+                        $eventSignificantChangeHash .= implode(',', $exdate).';';
                     } elseif ('RRULE' === $prop) {
-                        $significantChangeHash .= implode(',', $rrule).';';
+                        $eventSignificantChangeHash .= implode(',', $rrule).';';
                     } else {
                         foreach ($propertyValues as $val) {
-                            $significantChangeHash .= $val->getValue().';';
+                            $eventSignificantChangeHash .= $val->getValue().';';
                         }
                     }
                 }
             }
+            $significantChangeEventProperties[] = $eventSignificantChangeHash;
+        }
+
+        asort($significantChangeEventProperties);
+
+        foreach ($significantChangeEventProperties as $eventSignificantChangeHash) {
+            $significantChangeHash .= $eventSignificantChangeHash;
         }
         $significantChangeHash = md5($significantChangeHash);
 
diff --git a/vendor/sabre/vobject/lib/Node.php b/vendor/sabre/vobject/lib/Node.php
index 4c0c04f72..2041b2ac7 100644
--- a/vendor/sabre/vobject/lib/Node.php
+++ b/vendor/sabre/vobject/lib/Node.php
@@ -73,6 +73,7 @@ abstract class Node implements \IteratorAggregate, \ArrayAccess, \Countable, \Js
      *
      * @return array
      */
+    #[\ReturnTypeWillChange]
     abstract public function jsonSerialize();
 
     /**
@@ -102,6 +103,7 @@ abstract class Node implements \IteratorAggregate, \ArrayAccess, \Countable, \Js
      *
      * @return ElementList
      */
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         if (!is_null($this->iterator)) {
@@ -157,6 +159,7 @@ abstract class Node implements \IteratorAggregate, \ArrayAccess, \Countable, \Js
      *
      * @return int
      */
+    #[\ReturnTypeWillChange]
     public function count()
     {
         $it = $this->getIterator();
@@ -177,6 +180,7 @@ abstract class Node implements \IteratorAggregate, \ArrayAccess, \Countable, \Js
      *
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function offsetExists($offset)
     {
         $iterator = $this->getIterator();
@@ -193,6 +197,7 @@ abstract class Node implements \IteratorAggregate, \ArrayAccess, \Countable, \Js
      *
      * @return mixed
      */
+    #[\ReturnTypeWillChange]
     public function offsetGet($offset)
     {
         $iterator = $this->getIterator();
@@ -208,6 +213,7 @@ abstract class Node implements \IteratorAggregate, \ArrayAccess, \Countable, \Js
      * @param int   $offset
      * @param mixed $value
      */
+    #[\ReturnTypeWillChange]
     public function offsetSet($offset, $value)
     {
         $iterator = $this->getIterator();
@@ -228,6 +234,7 @@ abstract class Node implements \IteratorAggregate, \ArrayAccess, \Countable, \Js
      *
      * @param int $offset
      */
+    #[\ReturnTypeWillChange]
     public function offsetUnset($offset)
     {
         $iterator = $this->getIterator();
diff --git a/vendor/sabre/vobject/lib/Parameter.php b/vendor/sabre/vobject/lib/Parameter.php
index 72f2ecbcb..7e4d55743 100644
--- a/vendor/sabre/vobject/lib/Parameter.php
+++ b/vendor/sabre/vobject/lib/Parameter.php
@@ -321,6 +321,7 @@ class Parameter extends Node
      *
      * @return array
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return $this->value;
@@ -354,6 +355,7 @@ class Parameter extends Node
      *
      * @return ElementList
      */
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         if (!is_null($this->iterator)) {
diff --git a/vendor/sabre/vobject/lib/Parser/MimeDir.php b/vendor/sabre/vobject/lib/Parser/MimeDir.php
index 385d340d7..db0f81531 100644
--- a/vendor/sabre/vobject/lib/Parser/MimeDir.php
+++ b/vendor/sabre/vobject/lib/Parser/MimeDir.php
@@ -439,7 +439,7 @@ class MimeDir extends Parser
             $propObj->add(null, $namelessParameter);
         }
 
-        if ('QUOTED-PRINTABLE' === strtoupper($propObj['ENCODING'])) {
+        if (isset($propObj['ENCODING']) && 'QUOTED-PRINTABLE' === strtoupper($propObj['ENCODING'])) {
             $propObj->setQuotedPrintableValue($this->extractQuotedPrintableValue());
         } else {
             $charset = $this->charset;
@@ -518,7 +518,7 @@ class MimeDir extends Parser
      *
      * Now for the parameters
      *
-     * If delimiter is not set (null) this method will just return a string.
+     * If delimiter is not set (empty string) this method will just return a string.
      * If it's a comma or a semi-colon the string will be split on those
      * characters, and always return an array.
      *
diff --git a/vendor/sabre/vobject/lib/Property.php b/vendor/sabre/vobject/lib/Property.php
index f9cf8e38e..50cda9684 100644
--- a/vendor/sabre/vobject/lib/Property.php
+++ b/vendor/sabre/vobject/lib/Property.php
@@ -52,7 +52,7 @@ abstract class Property extends Node
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
     public $delimiter = ';';
 
@@ -276,6 +276,7 @@ abstract class Property extends Node
      *
      * @return array
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         $parameters = [];
@@ -387,6 +388,7 @@ abstract class Property extends Node
      *
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function offsetExists($name)
     {
         if (is_int($name)) {
@@ -413,6 +415,7 @@ abstract class Property extends Node
      *
      * @return Node
      */
+    #[\ReturnTypeWillChange]
     public function offsetGet($name)
     {
         if (is_int($name)) {
@@ -433,6 +436,7 @@ abstract class Property extends Node
      * @param string $name
      * @param mixed  $value
      */
+    #[\ReturnTypeWillChange]
     public function offsetSet($name, $value)
     {
         if (is_int($name)) {
@@ -453,6 +457,7 @@ abstract class Property extends Node
      *
      * @param string $name
      */
+    #[\ReturnTypeWillChange]
     public function offsetUnset($name)
     {
         if (is_int($name)) {
diff --git a/vendor/sabre/vobject/lib/Property/Binary.php b/vendor/sabre/vobject/lib/Property/Binary.php
index ec6713fdd..1262dd054 100644
--- a/vendor/sabre/vobject/lib/Property/Binary.php
+++ b/vendor/sabre/vobject/lib/Property/Binary.php
@@ -24,9 +24,9 @@ class Binary extends Property
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Updates the current value.
diff --git a/vendor/sabre/vobject/lib/Property/FloatValue.php b/vendor/sabre/vobject/lib/Property/FloatValue.php
index 0d0346968..e780ae6c1 100644
--- a/vendor/sabre/vobject/lib/Property/FloatValue.php
+++ b/vendor/sabre/vobject/lib/Property/FloatValue.php
@@ -21,7 +21,7 @@ class FloatValue extends Property
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
     public $delimiter = ';';
 
diff --git a/vendor/sabre/vobject/lib/Property/ICalendar/CalAddress.php b/vendor/sabre/vobject/lib/Property/ICalendar/CalAddress.php
index 86be66c15..2dbbc6eaf 100644
--- a/vendor/sabre/vobject/lib/Property/ICalendar/CalAddress.php
+++ b/vendor/sabre/vobject/lib/Property/ICalendar/CalAddress.php
@@ -19,9 +19,9 @@ class CalAddress extends Text
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.
diff --git a/vendor/sabre/vobject/lib/Property/ICalendar/DateTime.php b/vendor/sabre/vobject/lib/Property/ICalendar/DateTime.php
index d635e17ae..ca71633b9 100644
--- a/vendor/sabre/vobject/lib/Property/ICalendar/DateTime.php
+++ b/vendor/sabre/vobject/lib/Property/ICalendar/DateTime.php
@@ -300,6 +300,7 @@ class DateTime extends Property
      * @param string $name
      * @param mixed  $value
      */
+    #[\ReturnTypeWillChange]
     public function offsetSet($name, $value)
     {
         parent::offsetSet($name, $value);
diff --git a/vendor/sabre/vobject/lib/Property/ICalendar/Duration.php b/vendor/sabre/vobject/lib/Property/ICalendar/Duration.php
index 87f008160..e18fe191e 100644
--- a/vendor/sabre/vobject/lib/Property/ICalendar/Duration.php
+++ b/vendor/sabre/vobject/lib/Property/ICalendar/Duration.php
@@ -22,7 +22,7 @@ class Duration extends Property
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
     public $delimiter = ',';
 
diff --git a/vendor/sabre/vobject/lib/Property/ICalendar/Period.php b/vendor/sabre/vobject/lib/Property/ICalendar/Period.php
index eb3752770..ae8a78911 100644
--- a/vendor/sabre/vobject/lib/Property/ICalendar/Period.php
+++ b/vendor/sabre/vobject/lib/Property/ICalendar/Period.php
@@ -23,7 +23,7 @@ class Period extends Property
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
     public $delimiter = ',';
 
diff --git a/vendor/sabre/vobject/lib/Property/Time.php b/vendor/sabre/vobject/lib/Property/Time.php
index 544b5ced3..1b81609aa 100644
--- a/vendor/sabre/vobject/lib/Property/Time.php
+++ b/vendor/sabre/vobject/lib/Property/Time.php
@@ -19,9 +19,9 @@ class Time extends Text
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.
diff --git a/vendor/sabre/vobject/lib/Property/Uri.php b/vendor/sabre/vobject/lib/Property/Uri.php
index 830cd3f18..1ad1fb199 100644
--- a/vendor/sabre/vobject/lib/Property/Uri.php
+++ b/vendor/sabre/vobject/lib/Property/Uri.php
@@ -20,9 +20,9 @@ class Uri extends Text
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.
diff --git a/vendor/sabre/vobject/lib/Property/UtcOffset.php b/vendor/sabre/vobject/lib/Property/UtcOffset.php
index 248ed40ea..04b88447f 100644
--- a/vendor/sabre/vobject/lib/Property/UtcOffset.php
+++ b/vendor/sabre/vobject/lib/Property/UtcOffset.php
@@ -17,9 +17,9 @@ class UtcOffset extends Text
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.
diff --git a/vendor/sabre/vobject/lib/Property/VCard/DateAndOrTime.php b/vendor/sabre/vobject/lib/Property/VCard/DateAndOrTime.php
index 09918b31a..7bf79c48c 100644
--- a/vendor/sabre/vobject/lib/Property/VCard/DateAndOrTime.php
+++ b/vendor/sabre/vobject/lib/Property/VCard/DateAndOrTime.php
@@ -24,9 +24,9 @@ class DateAndOrTime extends Property
     /**
      * Field separator.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.
diff --git a/vendor/sabre/vobject/lib/Property/VCard/TimeStamp.php b/vendor/sabre/vobject/lib/Property/VCard/TimeStamp.php
index fccf2d600..da6ea3d44 100644
--- a/vendor/sabre/vobject/lib/Property/VCard/TimeStamp.php
+++ b/vendor/sabre/vobject/lib/Property/VCard/TimeStamp.php
@@ -21,9 +21,9 @@ class TimeStamp extends Text
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.
diff --git a/vendor/sabre/vobject/lib/Recur/EventIterator.php b/vendor/sabre/vobject/lib/Recur/EventIterator.php
index e42ca1360..61f05d7de 100644
--- a/vendor/sabre/vobject/lib/Recur/EventIterator.php
+++ b/vendor/sabre/vobject/lib/Recur/EventIterator.php
@@ -198,6 +198,7 @@ class EventIterator implements \Iterator
      *
      * @return DateTimeImmutable
      */
+    #[\ReturnTypeWillChange]
     public function current()
     {
         if ($this->currentDate) {
@@ -229,9 +230,13 @@ class EventIterator implements \Iterator
         if (!$this->valid()) {
             return;
         }
-        $end = clone $this->currentDate;
+        if ($this->currentOverriddenEvent && $this->currentOverriddenEvent->DTEND) {
+            return $this->currentOverriddenEvent->DTEND->getDateTime($this->timeZone);
+        } else {
+            $end = clone $this->currentDate;
 
-        return $end->modify('+'.$this->eventDuration.' seconds');
+            return $end->modify('+'.$this->eventDuration.' seconds');
+        }
     }
 
     /**
@@ -281,6 +286,7 @@ class EventIterator implements \Iterator
      *
      * @return int
      */
+    #[\ReturnTypeWillChange]
     public function key()
     {
         // The counter is always 1 ahead.
@@ -293,6 +299,7 @@ class EventIterator implements \Iterator
      *
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         if ($this->counter > Settings::$maxRecurrences && -1 !== Settings::$maxRecurrences) {
@@ -304,7 +311,10 @@ class EventIterator implements \Iterator
 
     /**
      * Sets the iterator back to the starting point.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->recurIterator->rewind();
@@ -327,7 +337,10 @@ class EventIterator implements \Iterator
 
     /**
      * Advances the iterator with one step.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         $this->currentOverriddenEvent = null;
diff --git a/vendor/sabre/vobject/lib/Recur/RDateIterator.php b/vendor/sabre/vobject/lib/Recur/RDateIterator.php
index d117e152c..5d56657fa 100644
--- a/vendor/sabre/vobject/lib/Recur/RDateIterator.php
+++ b/vendor/sabre/vobject/lib/Recur/RDateIterator.php
@@ -35,6 +35,7 @@ class RDateIterator implements Iterator
 
     /* Implementation of the Iterator interface {{{ */
 
+    #[\ReturnTypeWillChange]
     public function current()
     {
         if (!$this->valid()) {
@@ -49,6 +50,7 @@ class RDateIterator implements Iterator
      *
      * @return int
      */
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->counter;
@@ -60,6 +62,7 @@ class RDateIterator implements Iterator
      *
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         return $this->counter <= count($this->dates);
@@ -67,7 +70,10 @@ class RDateIterator implements Iterator
 
     /**
      * Resets the iterator.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->currentDate = clone $this->startDate;
@@ -76,7 +82,10 @@ class RDateIterator implements Iterator
 
     /**
      * Goes on to the next iteration.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         ++$this->counter;
diff --git a/vendor/sabre/vobject/lib/Recur/RRuleIterator.php b/vendor/sabre/vobject/lib/Recur/RRuleIterator.php
index 0511f0ade..d556aa6c3 100644
--- a/vendor/sabre/vobject/lib/Recur/RRuleIterator.php
+++ b/vendor/sabre/vobject/lib/Recur/RRuleIterator.php
@@ -38,6 +38,7 @@ class RRuleIterator implements Iterator
 
     /* Implementation of the Iterator interface {{{ */
 
+    #[\ReturnTypeWillChange]
     public function current()
     {
         if (!$this->valid()) {
@@ -52,6 +53,7 @@ class RRuleIterator implements Iterator
      *
      * @return int
      */
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->counter;
@@ -64,6 +66,7 @@ class RRuleIterator implements Iterator
      *
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         if (null === $this->currentDate) {
@@ -78,7 +81,10 @@ class RRuleIterator implements Iterator
 
     /**
      * Resets the iterator.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->currentDate = clone $this->startDate;
@@ -87,7 +93,10 @@ class RRuleIterator implements Iterator
 
     /**
      * Goes on to the next iteration.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         // Otherwise, we find the next event in the normal RRULE
diff --git a/vendor/sabre/vobject/lib/TimeZoneUtil.php b/vendor/sabre/vobject/lib/TimeZoneUtil.php
index 2c407fee6..6422c0930 100644
--- a/vendor/sabre/vobject/lib/TimeZoneUtil.php
+++ b/vendor/sabre/vobject/lib/TimeZoneUtil.php
@@ -2,6 +2,16 @@
 
 namespace Sabre\VObject;
 
+use DateTimeZone;
+use InvalidArgumentException;
+use Sabre\VObject\TimezoneGuesser\FindFromOffset;
+use Sabre\VObject\TimezoneGuesser\FindFromTimezoneIdentifier;
+use Sabre\VObject\TimezoneGuesser\FindFromTimezoneMap;
+use Sabre\VObject\TimezoneGuesser\GuessFromLicEntry;
+use Sabre\VObject\TimezoneGuesser\GuessFromMsTzId;
+use Sabre\VObject\TimezoneGuesser\TimezoneFinder;
+use Sabre\VObject\TimezoneGuesser\TimezoneGuesser;
+
 /**
  * Time zone name translation.
  *
@@ -14,17 +24,136 @@ namespace Sabre\VObject;
  */
 class TimeZoneUtil
 {
+    /** @var self */
+    private static $instance = null;
+
+    /** @var TimezoneGuesser[] */
+    private $timezoneGuessers = [];
+
+    /** @var TimezoneFinder[] */
+    private $timezoneFinders = [];
+
+    private function __construct()
+    {
+        $this->addGuesser('lic', new GuessFromLicEntry());
+        $this->addGuesser('msTzId', new GuessFromMsTzId());
+        $this->addFinder('tzid', new FindFromTimezoneIdentifier());
+        $this->addFinder('tzmap', new FindFromTimezoneMap());
+        $this->addFinder('offset', new FindFromOffset());
+    }
+
+    private static function getInstance(): self
+    {
+        if (null === self::$instance) {
+            self::$instance = new self();
+        }
+
+        return self::$instance;
+    }
+
+    private function addGuesser(string $key, TimezoneGuesser $guesser): void
+    {
+        $this->timezoneGuessers[$key] = $guesser;
+    }
+
+    private function addFinder(string $key, TimezoneFinder $finder): void
+    {
+        $this->timezoneFinders[$key] = $finder;
+    }
+
+    /**
+     * This method will try to find out the correct timezone for an iCalendar
+     * date-time value.
+     *
+     * You must pass the contents of the TZID parameter, as well as the full
+     * calendar.
+     *
+     * If the lookup fails, this method will return the default PHP timezone
+     * (as configured using date_default_timezone_set, or the date.timezone ini
+     * setting).
+     *
+     * Alternatively, if $failIfUncertain is set to true, it will throw an
+     * exception if we cannot accurately determine the timezone.
+     */
+    private function findTimeZone(string $tzid, Component $vcalendar = null, bool $failIfUncertain = false): DateTimeZone
+    {
+        foreach ($this->timezoneFinders as $timezoneFinder) {
+            $timezone = $timezoneFinder->find($tzid, $failIfUncertain);
+            if (!$timezone instanceof DateTimeZone) {
+                continue;
+            }
+
+            return $timezone;
+        }
+
+        if ($vcalendar) {
+            // If that didn't work, we will scan VTIMEZONE objects
+            foreach ($vcalendar->select('VTIMEZONE') as $vtimezone) {
+                if ((string) $vtimezone->TZID === $tzid) {
+                    foreach ($this->timezoneGuessers as $timezoneGuesser) {
+                        $timezone = $timezoneGuesser->guess($vtimezone, $failIfUncertain);
+                        if (!$timezone instanceof DateTimeZone) {
+                            continue;
+                        }
+
+                        return $timezone;
+                    }
+                }
+            }
+        }
+
+        if ($failIfUncertain) {
+            throw new InvalidArgumentException('We were unable to determine the correct PHP timezone for tzid: '.$tzid);
+        }
+
+        // If we got all the way here, we default to whatever has been set as the PHP default timezone.
+        return new DateTimeZone(date_default_timezone_get());
+    }
+
+    public static function addTimezoneGuesser(string $key, TimezoneGuesser $guesser): void
+    {
+        self::getInstance()->addGuesser($key, $guesser);
+    }
+
+    public static function addTimezoneFinder(string $key, TimezoneFinder $finder): void
+    {
+        self::getInstance()->addFinder($key, $finder);
+    }
+
+    /**
+     * @param string $tzid
+     * @param false  $failIfUncertain
+     *
+     * @return DateTimeZone
+     */
+    public static function getTimeZone($tzid, Component $vcalendar = null, $failIfUncertain = false)
+    {
+        return self::getInstance()->findTimeZone($tzid, $vcalendar, $failIfUncertain);
+    }
+
+    public static function clean(): void
+    {
+        self::$instance = null;
+    }
+
+    // Keeping things for backwards compatibility
+    /**
+     * @var array|null
+     *
+     * @deprecated
+     */
     public static $map = null;
 
     /**
      * List of microsoft exchange timezone ids.
      *
      * Source: http://msdn.microsoft.com/en-us/library/aa563018(loband).aspx
+     *
+     * @deprecated
      */
     public static $microsoftExchangeMap = [
         0 => 'UTC',
         31 => 'Africa/Casablanca',
-
         // Insanely, id #2 is used for both Europe/Lisbon, and Europe/Sarajevo.
         // I'm not even kidding.. We handle this special case in the
         // getTimeZone method.
@@ -104,134 +233,10 @@ class TimeZoneUtil
     ];
 
     /**
-     * This method will try to find out the correct timezone for an iCalendar
-     * date-time value.
-     *
-     * You must pass the contents of the TZID parameter, as well as the full
-     * calendar.
-     *
-     * If the lookup fails, this method will return the default PHP timezone
-     * (as configured using date_default_timezone_set, or the date.timezone ini
-     * setting).
-     *
-     * Alternatively, if $failIfUncertain is set to true, it will throw an
-     * exception if we cannot accurately determine the timezone.
-     *
-     * @param string                  $tzid
-     * @param Sabre\VObject\Component $vcalendar
-     *
-     * @return \DateTimeZone
-     */
-    public static function getTimeZone($tzid, Component $vcalendar = null, $failIfUncertain = false)
-    {
-        // First we will just see if the tzid is a support timezone identifier.
-        //
-        // The only exception is if the timezone starts with (. This is to
-        // handle cases where certain microsoft products generate timezone
-        // identifiers that for instance look like:
-        //
-        // (GMT+01.00) Sarajevo/Warsaw/Zagreb
-        //
-        // Since PHP 5.5.10, the first bit will be used as the timezone and
-        // this method will return just GMT+01:00. This is wrong, because it
-        // doesn't take DST into account.
-        if ('(' !== $tzid[0]) {
-            // PHP has a bug that logs PHP warnings even it shouldn't:
-            // https://bugs.php.net/bug.php?id=67881
-            //
-            // That's why we're checking if we'll be able to successfully instantiate
-            // \DateTimeZone() before doing so. Otherwise we could simply instantiate
-            // and catch the exception.
-            $tzIdentifiers = \DateTimeZone::listIdentifiers();
-
-            try {
-                if (
-                    (in_array($tzid, $tzIdentifiers)) ||
-                    (preg_match('/^GMT(\+|-)([0-9]{4})$/', $tzid, $matches)) ||
-                    (in_array($tzid, self::getIdentifiersBC()))
-                ) {
-                    return new \DateTimeZone($tzid);
-                }
-            } catch (\Exception $e) {
-            }
-        }
-
-        self::loadTzMaps();
-
-        // Next, we check if the tzid is somewhere in our tzid map.
-        if (isset(self::$map[$tzid])) {
-            return new \DateTimeZone(self::$map[$tzid]);
-        }
-
-        // Some Microsoft products prefix the offset first, so let's strip that off
-        // and see if it is our tzid map.  We don't want to check for this first just
-        // in case there are overrides in our tzid map.
-        if (preg_match('/^\((UTC|GMT)(\+|\-)[\d]{2}\:[\d]{2}\) (.*)/', $tzid, $matches)) {
-            $tzidAlternate = $matches[3];
-            if (isset(self::$map[$tzidAlternate])) {
-                return new \DateTimeZone(self::$map[$tzidAlternate]);
-            }
-        }
-
-        // Maybe the author was hyper-lazy and just included an offset. We
-        // support it, but we aren't happy about it.
-        if (preg_match('/^GMT(\+|-)([0-9]{4})$/', $tzid, $matches)) {
-            // Note that the path in the source will never be taken from PHP 5.5.10
-            // onwards. PHP 5.5.10 supports the "GMT+0100" style of format, so it
-            // already gets returned early in this function. Once we drop support
-            // for versions under PHP 5.5.10, this bit can be taken out of the
-            // source.
-            // @codeCoverageIgnoreStart
-            return new \DateTimeZone('Etc/GMT'.$matches[1].ltrim(substr($matches[2], 0, 2), '0'));
-            // @codeCoverageIgnoreEnd
-        }
-
-        if ($vcalendar) {
-            // If that didn't work, we will scan VTIMEZONE objects
-            foreach ($vcalendar->select('VTIMEZONE') as $vtimezone) {
-                if ((string) $vtimezone->TZID === $tzid) {
-                    // Some clients add 'X-LIC-LOCATION' with the olson name.
-                    if (isset($vtimezone->{'X-LIC-LOCATION'})) {
-                        $lic = (string) $vtimezone->{'X-LIC-LOCATION'};
-
-                        // Libical generators may specify strings like
-                        // "SystemV/EST5EDT". For those we must remove the
-                        // SystemV part.
-                        if ('SystemV/' === substr($lic, 0, 8)) {
-                            $lic = substr($lic, 8);
-                        }
-
-                        return self::getTimeZone($lic, null, $failIfUncertain);
-                    }
-                    // Microsoft may add a magic number, which we also have an
-                    // answer for.
-                    if (isset($vtimezone->{'X-MICROSOFT-CDO-TZID'})) {
-                        $cdoId = (int) $vtimezone->{'X-MICROSOFT-CDO-TZID'}->getValue();
-
-                        // 2 can mean both Europe/Lisbon and Europe/Sarajevo.
-                        if (2 === $cdoId && false !== strpos((string) $vtimezone->TZID, 'Sarajevo')) {
-                            return new \DateTimeZone('Europe/Sarajevo');
-                        }
-
-                        if (isset(self::$microsoftExchangeMap[$cdoId])) {
-                            return new \DateTimeZone(self::$microsoftExchangeMap[$cdoId]);
-                        }
-                    }
-                }
-            }
-        }
-
-        if ($failIfUncertain) {
-            throw new \InvalidArgumentException('We were unable to determine the correct PHP timezone for tzid: '.$tzid);
-        }
-
-        // If we got all the way here, we default to UTC.
-        return new \DateTimeZone(date_default_timezone_get());
-    }
-
-    /**
      * This method will load in all the tz mapping information, if it's not yet
      * done.
+     *
+     * @deprecated
      */
     public static function loadTzMaps()
     {
@@ -257,6 +262,8 @@ class TimeZoneUtil
      * (See timezonedata/php-bc.php and timezonedata php-workaround.php)
      *
      * @return array
+     *
+     * @deprecated
      */
     public static function getIdentifiersBC()
     {
diff --git a/vendor/sabre/vobject/lib/Version.php b/vendor/sabre/vobject/lib/Version.php
index 63452400f..64938bf0b 100644
--- a/vendor/sabre/vobject/lib/Version.php
+++ b/vendor/sabre/vobject/lib/Version.php
@@ -14,5 +14,5 @@ class Version
     /**
      * Full version number.
      */
-    const VERSION = '4.3.5';
+    const VERSION = '4.4.1';
 }
diff --git a/vendor/sabre/xml/.gitignore b/vendor/sabre/xml/.gitignore
deleted file mode 100644
index 9715e9028..000000000
--- a/vendor/sabre/xml/.gitignore
+++ /dev/null
@@ -1,8 +0,0 @@
-# Composer
-vendor
-composer.lock
-
-# Tests
-tests/cov
-tests/.phpunit.result.cache
-.php_cs.cache
diff --git a/vendor/sabre/xml/.php_cs.dist b/vendor/sabre/xml/.php_cs.dist
deleted file mode 100644
index c5c78a971..000000000
--- a/vendor/sabre/xml/.php_cs.dist
+++ /dev/null
@@ -1,12 +0,0 @@
-<?php
-
-$config = PhpCsFixer\Config::create();
-$config->getFinder()
-    ->exclude('vendor')
-    ->in(__DIR__);
-$config->setRules([
-    '@PSR1' => true,
-    '@Symfony' => true
-]);
-
-return $config;
\ No newline at end of file
diff --git a/vendor/sabre/xml/.travis.yml b/vendor/sabre/xml/.travis.yml
deleted file mode 100644
index fc4a98d8e..000000000
--- a/vendor/sabre/xml/.travis.yml
+++ /dev/null
@@ -1,49 +0,0 @@
-language: php
-sudo: required
-php:
-  - 7.1
-  - 7.2
-  - 7.3
-  - 7.4
-
-env:
-  global:
-    - RUN_PHPCSFIXER="TRUE"
-    - RUN_PHPUNIT="TRUE"
-    - RUN_PHPSTAN="FALSE"
-  matrix:
-    - PREFER_LOWEST="" REPORT_COVERAGE="TRUE" WITH_COVERAGE="--coverage-clover=coverage.xml"
-    - PREFER_LOWEST="--prefer-lowest" REPORT_COVERAGE="FALSE" WITH_COVERAGE=""
-
-matrix:
-  include:
-    - name: 'PHP8'
-      dist: focal
-      php: nightly
-      env:
-        - RUN_PHPCSFIXER="FALSE"
-        - REPORT_COVERAGE="FALSE"
-    - name: 'PHPStan'
-      php: 7.4
-      env:
-        - RUN_PHPCSFIXER="FALSE"
-        - RUN_PHPUNIT="FALSE"
-        - RUN_PHPSTAN="TRUE"
-        - REPORT_COVERAGE="FALSE"
-  fast_finish: true
-
-cache:
-  directories:
-    - $HOME/.composer/cache
-
-before_script:
-  - if [ $RUN_PHPCSFIXER == "FALSE" ]; then composer remove --dev friendsofphp/php-cs-fixer; fi
-  - composer update $PREFER_LOWEST
-
-script:
-  - if [ $RUN_PHPCSFIXER == "TRUE" ]; then php vendor/bin/php-cs-fixer fix --dry-run --diff; fi
-  - if [ $RUN_PHPUNIT == "TRUE" ]; then php vendor/bin/phpunit --configuration tests/phpunit.xml $WITH_COVERAGE; fi
-  - if [ $RUN_PHPSTAN == "TRUE" ]; then composer phpstan; fi
-
-after_success:
-  - if [ $REPORT_COVERAGE == "TRUE" ]; then bash <(curl -s https://codecov.io/bash); fi
diff --git a/vendor/sabre/xml/CHANGELOG.md b/vendor/sabre/xml/CHANGELOG.md
deleted file mode 100644
index cdd21fe51..000000000
--- a/vendor/sabre/xml/CHANGELOG.md
+++ /dev/null
@@ -1,287 +0,0 @@
-ChangeLog
-=========
-
-2.2.3 (2020-10-03)
-------------------
-* #191: add changelog and version bump that was missed in 2.2.2
-
-2.2.2 (2020-10-03)
-------------------
-* #190: adjust libxml_disable_entity_loader calls ready for PHP 8.0 (@phil-davis)
-
-2.2.1 (2020-05-11)
-------------------
-
-* #183: fixed warning 'xml cannot be empty while reading', which might lead to a infinite-loop (@mrow4a)
-* #179, #178, #177 #176: several build/continous integration related improvements (@phil-davis)
-
-2.2.0 (2020-01-31)
-------------------
-
-* #171: Added Support for PHP 7.4, dropped Support for PHP 7.0 (@staabm, @phil-davis)
-* #174: Update testsuite to phpunit8 (@phil-davis)
-* Added phpstan coverage (@phil-davis)
-* #144: Added a new `functionCaller` deserializer function for executing a callable when reading a XML
-element (@vsouz4)
-
-
-2.1.3 (2019-08-14)
-------------------
-
-* #166: Throw exception when empty inputs found
-
-
-2.1.2 (2019-01-09)
-------------------
-
-* #161: Prevent infinite loop on empty xml elements
-
-
-2.1.1 (2018-10-09)
-------------------
-
-* #149: Properly detect xml parse errors in `parseCurrentElement()` edge-cases
-
-
-2.1.0 (2018-02-08)
-------------------
-
-* #112: Added a `mixedContent` deserializer function, which might be useful
-  if you're parsing HTML-like documents with elements that contain both text
-  and other elements as siblings. (@staabm).
-
-
-2.0.0 (2016-11-15)
-------------------
-
-* Now requires PHP 7.
-* Uses typehints everywhere.
-* Fixed some minor strict typing-related issues.
-* Removed workaround for PHP bug [64230](https://bugs.php.net/bug.php?id=64230).
-
-
-1.5.0 (2016-10-09)
-------------------
-
-* Now requires PHP 5.5.
-* Using `finally` to always roll back the context stack when serializing.
-* #94: Fixed an infinite loop condition when reading some invalid XML
-  documents.
-
-
-1.4.2 (2016-05-19)
-------------------
-
-* The `contextStack` in the Reader object is now correctly rolled back in
-  error conditions (@staabm).
-* repeatingElements deserializer now still parses if a bare element name
-  without clark notation was given.
-* `$elementMap` in the Reader now also supports bare element names.
-* `Service::expect()` can now also work with bare element names.
-
-
-1.4.1 (2016-03-12)
------------------
-
-* Parsing clark-notation is now cached. This can speed up parsing large
-  documents with lots of repeating elements a fair bit. (@icewind1991).
-
-
-1.4.0 (2016-02-14)
-------------------
-
-* Any array thrown into the serializer with numeric keys is now simply
-  traversed and each individual item is serialized. This fixes an issue
-  related to serializing value objects with array children.
-* When serializing value objects, properties that have a null value or an
-  empty array are now skipped. We believe this to be the saner default, but
-  does constitute a BC break for those depending on this.
-* Serializing array properties in value objects was broken.
-
-
-1.3.0 (2015-12-29)
-------------------
-
-* The `Service` class adds a new `mapValueObject` method which provides basic
-  capabilities to map between ValueObjects and XML.
-* #61: You can now specify serializers for specific classes, allowing you
-  separate the object you want to serialize from the serializer. This uses the
-  `$classMap` property which is defined on both the `Service` and `Writer`.
-* It's now possible to pass an array of possible root elements to
-  `Sabre\Xml\Service::expect()`.
-* Moved some parsing logic to `Reader::getDeserializerForElementName()`,
-  so people with more advanced use-cases can implement their own logic there.
-* #63: When serializing elements using arrays, the `value` key in the array is
-  now optional.
-* #62: Added a `keyValue` deserializer function. This can be used instead of
-  the `Element\KeyValue` class and is a lot more flexible. (@staabm)
-* Also added an `enum` deserializer function to replace
-  `Element\Elements`.
-* Using an empty string for a namespace prefix now has the same effect as
-  `null`.
-
-
-1.2.0 (2015-08-30)
-------------------
-
-* #53: Added `parseGetElements`, a function like `parseInnerTree`, except
-  that it always returns an array of elements, or an empty array.
-
-
-1.1.0 (2015-06-29)
-------------------
-
-* #44, #45: Catching broken and invalid XML better and throwing
-  `Sabre\Xml\LibXMLException` whenever we encounter errors. (@stefanmajoor,
-   @DaanBiesterbos)
-
-
-1.0.0 (2015-05-25)
-------------------
-
-* No functional changes since 0.4.3. Marking it as 1.0.0 as a promise for
-  API stability.
-* Using php-cs-fixer for automated CS enforcement.
-
-
-0.4.3 (2015-04-01)
------------------
-
-* Minor tweaks for the public release.
-
-
-0.4.2 (2015-03-20)
-------------------
-
-* Removed `constants.php` again. They messed with PHPUnit and don't really
-  provide a great benefit.
-* #41: Correctly handle self-closing xml elements.
-
-
-0.4.1 (2015-03-19)
-------------------
-
-* #40: An element with an empty namespace (xmlns="") is not allowed to have a
-  prefix. This is now fixed.
-
-
-0.4.0 (2015-03-18)
-------------------
-
-* Added `Sabre\Xml\Service`. This is intended as a simple way to centrally
-  configure xml applications and easily parse/write things from there. #35, #38.
-* Renamed 'baseUri' to 'contextUri' everywhere.
-* #36: Added a few convenience constants to `lib/constants.php`.
-* `Sabre\Xml\Util::parseClarkNotation` is now in the `Sabre\Xml\Service` class.
-
-
-0.3.1 (2015-02-08)
-------------------
-
-* Added `XmlDeserializable` to match `XmlSerializable`.
-
-
-0.3.0 (2015-02-06)
-------------------
-
-* Added `$elementMap` argument to parseInnerTree, for quickly overriding
-  parsing rules within an element.
-
-
-0.2.2 (2015-02-05)
-------------------
-
-* Now depends on sabre/uri 1.0.
-
-
-0.2.1 (2014-12-17)
-------------------
-
-* LibXMLException now inherits from ParseException, so it's easy for users to
-  catch any exception thrown by the parser.
-
-
-0.2.0 (2014-12-05)
-------------------
-
-* Major BC Break: method names for the Element interface have been renamed
-  from `serializeXml` and `deserializeXml` to `xmlSerialize` and
-  `xmlDeserialize`. This is so that it matches PHP's `JsonSerializable`
-  interface.
-* #25: Added `XmlSerializable` to allow people to write serializers without
-  having to implement a deserializer in the same class.
-* #26: Renamed the `Sabre\XML` namespace to `Sabre\Xml`. Due to composer magic
-  and the fact that PHP namespace are case-insensitive, this should not affect
-  anyone, unless you are doing exact string matches on class names.
-* #23: It's not possible to automatically extract or serialize Xml fragments
-  from documents using `Sabre\Xml\Element\XmlFragment`.
-
-
-0.1.0 (2014-11-24)
-------------------
-
-* #16: Added ability to override `elementMap`, `namespaceMap` and `baseUri` for
-  a fragment of a document during reading an writing using `pushContext` and
-  `popContext`.
-* Removed: `Writer::$context` and `Reader::$context`.
-* #15: Added `Reader::$baseUri` to match `Writer::$baseUri`.
-* #20: Allow callbacks to be used instead of `Element` classes in the `Reader`.
-* #25: Added `readText` to quickly grab all text from a node and advance the
-  reader to the next node.
-* #15: Added `Sabre\XML\Element\Uri`.
-
-
-0.0.6 (2014-09-26)
-------------------
-
-* Added: `CData` element.
-* #13: Better support for xml with no namespaces. (@kalmas)
-* Switched to PSR-4 directory structure.
-
-
-0.0.5 (2013-03-27)
-------------------
-
-* Added: baseUri property to the Writer class.
-* Added: The writeElement method can now write complex elements.
-* Added: Throwing exception when invalid objects are written.
-
-
-0.0.4 (2013-03-14)
-------------------
-
-* Fixed: The KeyValue parser was skipping over elements when there was no
-  whitespace between them.
-* Fixed: Clearing libxml errors after parsing.
-* Added: Support for CDATA.
-* Added: Context properties.
-
-
-0.0.3 (2013-02-22)
-------------------
-
-* Changed: Reader::parse returns an array with 1 level less depth.
-* Added: A LibXMLException is now thrown if the XMLReader comes across an error.
-* Fixed: Both the Elements and KeyValue parsers had severe issues with
-  nesting.
-* Fixed: The reader now detects when the end of the document is hit before it
-  should (because we're still parsing an element).
-
-
-0.0.2 (2013-02-17)
-------------------
-
-* Added: Elements parser.
-* Added: KeyValue parser.
-* Change: Reader::parseSubTree is now named parseInnerTree, and returns either
-  a string (in case of a text-node), or an array (in case there were child
-  elements).
-* Added: Reader::parseCurrentElement is now public.
-
-
-0.0.1 (2013-02-07)
-------------------
-
-* First alpha release
-
-Project started: 2012-11-13. First experiments in June 2009.
diff --git a/vendor/sabre/xml/composer.json b/vendor/sabre/xml/composer.json
index b54cf195b..4524cf59b 100644
--- a/vendor/sabre/xml/composer.json
+++ b/vendor/sabre/xml/composer.json
@@ -44,7 +44,7 @@
         }
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "~2.16.1",
+        "friendsofphp/php-cs-fixer": "~2.17.1",
         "phpstan/phpstan": "^0.12",
         "phpunit/phpunit" : "^7.5 || ^8.5 || ^9.0"
     },
diff --git a/vendor/sabre/xml/lib/ContextStackTrait.php b/vendor/sabre/xml/lib/ContextStackTrait.php
index 757088847..4e15bd414 100644
--- a/vendor/sabre/xml/lib/ContextStackTrait.php
+++ b/vendor/sabre/xml/lib/ContextStackTrait.php
@@ -10,7 +10,7 @@ namespace Sabre\Xml;
  * The Context maintains information about a document during either reading or
  * writing.
  *
- * During this process, it may be neccesary to override this context
+ * During this process, it may be necessary to override this context
  * information.
  *
  * This trait allows easy access to the context, and allows the end-user to
diff --git a/vendor/sabre/xml/lib/Element/Base.php b/vendor/sabre/xml/lib/Element/Base.php
index a1ce7ea5a..8a93191b1 100644
--- a/vendor/sabre/xml/lib/Element/Base.php
+++ b/vendor/sabre/xml/lib/Element/Base.php
@@ -35,7 +35,7 @@ class Base implements Xml\Element
     }
 
     /**
-     * The xmlSerialize metod is called during xml writing.
+     * The xmlSerialize method is called during xml writing.
      *
      * Use the $writer argument to write its own xml serialization.
      *
@@ -58,7 +58,7 @@ class Base implements Xml\Element
     /**
      * The deserialize method is called during xml parsing.
      *
-     * This method is called statictly, this is because in theory this method
+     * This method is called statically, this is because in theory this method
      * may be used as a type of constructor, or factory method.
      *
      * Often you want to return an instance of the current class, but you are
diff --git a/vendor/sabre/xml/lib/Element/Cdata.php b/vendor/sabre/xml/lib/Element/Cdata.php
index 61d3213ff..1367343ff 100644
--- a/vendor/sabre/xml/lib/Element/Cdata.php
+++ b/vendor/sabre/xml/lib/Element/Cdata.php
@@ -12,7 +12,7 @@ use Sabre\Xml;
  * This element allows you to easily inject CDATA.
  *
  * Note that we strongly recommend avoiding CDATA nodes, unless you definitely
- * know what you're doing, or you're working with unchangable systems that
+ * know what you're doing, or you're working with unchangeable systems that
  * require CDATA.
  *
  * @copyright Copyright (C) 2009-2015 fruux GmbH (https://fruux.com/).
@@ -37,12 +37,12 @@ class Cdata implements Xml\XmlSerializable
     }
 
     /**
-     * The xmlSerialize metod is called during xml writing.
+     * The xmlSerialize method is called during xml writing.
      *
      * Use the $writer argument to write its own xml serialization.
      *
      * An important note: do _not_ create a parent element. Any element
-     * implementing XmlSerializble should only ever write what's considered
+     * implementing XmlSerializable should only ever write what's considered
      * its 'inner xml'.
      *
      * The parent of the current element is responsible for writing a
diff --git a/vendor/sabre/xml/lib/Element/Elements.php b/vendor/sabre/xml/lib/Element/Elements.php
index e51179833..fecce4c75 100644
--- a/vendor/sabre/xml/lib/Element/Elements.php
+++ b/vendor/sabre/xml/lib/Element/Elements.php
@@ -53,12 +53,12 @@ class Elements implements Xml\Element
     }
 
     /**
-     * The xmlSerialize metod is called during xml writing.
+     * The xmlSerialize method is called during xml writing.
      *
      * Use the $writer argument to write its own xml serialization.
      *
      * An important note: do _not_ create a parent element. Any element
-     * implementing XmlSerializble should only ever write what's considered
+     * implementing XmlSerializable should only ever write what's considered
      * its 'inner xml'.
      *
      * The parent of the current element is responsible for writing a
@@ -76,7 +76,7 @@ class Elements implements Xml\Element
     /**
      * The deserialize method is called during xml parsing.
      *
-     * This method is called statictly, this is because in theory this method
+     * This method is called statically, this is because in theory this method
      * may be used as a type of constructor, or factory method.
      *
      * Often you want to return an instance of the current class, but you are
diff --git a/vendor/sabre/xml/lib/Element/KeyValue.php b/vendor/sabre/xml/lib/Element/KeyValue.php
index dacee000a..17448880d 100644
--- a/vendor/sabre/xml/lib/Element/KeyValue.php
+++ b/vendor/sabre/xml/lib/Element/KeyValue.php
@@ -53,12 +53,12 @@ class KeyValue implements Xml\Element
     }
 
     /**
-     * The xmlSerialize metod is called during xml writing.
+     * The xmlSerialize method is called during xml writing.
      *
      * Use the $writer argument to write its own xml serialization.
      *
      * An important note: do _not_ create a parent element. Any element
-     * implementing XmlSerializble should only ever write what's considered
+     * implementing XmlSerializable should only ever write what's considered
      * its 'inner xml'.
      *
      * The parent of the current element is responsible for writing a
@@ -76,7 +76,7 @@ class KeyValue implements Xml\Element
     /**
      * The deserialize method is called during xml parsing.
      *
-     * This method is called staticly, this is because in theory this method
+     * This method is called statically, this is because in theory this method
      * may be used as a type of constructor, or factory method.
      *
      * Often you want to return an instance of the current class, but you are
diff --git a/vendor/sabre/xml/lib/Element/Uri.php b/vendor/sabre/xml/lib/Element/Uri.php
index 2644fbcd7..336212a53 100644
--- a/vendor/sabre/xml/lib/Element/Uri.php
+++ b/vendor/sabre/xml/lib/Element/Uri.php
@@ -42,12 +42,12 @@ class Uri implements Xml\Element
     }
 
     /**
-     * The xmlSerialize metod is called during xml writing.
+     * The xmlSerialize method is called during xml writing.
      *
      * Use the $writer argument to write its own xml serialization.
      *
      * An important note: do _not_ create a parent element. Any element
-     * implementing XmlSerializble should only ever write what's considered
+     * implementing XmlSerializable should only ever write what's considered
      * its 'inner xml'.
      *
      * The parent of the current element is responsible for writing a
diff --git a/vendor/sabre/xml/lib/Element/XmlFragment.php b/vendor/sabre/xml/lib/Element/XmlFragment.php
index 12109e5c9..bf110eaee 100644
--- a/vendor/sabre/xml/lib/Element/XmlFragment.php
+++ b/vendor/sabre/xml/lib/Element/XmlFragment.php
@@ -48,12 +48,12 @@ class XmlFragment implements Element
     }
 
     /**
-     * The xmlSerialize metod is called during xml writing.
+     * The xmlSerialize method is called during xml writing.
      *
      * Use the $writer argument to write its own xml serialization.
      *
      * An important note: do _not_ create a parent element. Any element
-     * implementing XmlSerializble should only ever write what's considered
+     * implementing XmlSerializable should only ever write what's considered
      * its 'inner xml'.
      *
      * The parent of the current element is responsible for writing a
@@ -121,7 +121,7 @@ XML;
     /**
      * The deserialize method is called during xml parsing.
      *
-     * This method is called statictly, this is because in theory this method
+     * This method is called statically, this is because in theory this method
      * may be used as a type of constructor, or factory method.
      *
      * Often you want to return an instance of the current class, but you are
diff --git a/vendor/sabre/xml/lib/LibXMLException.php b/vendor/sabre/xml/lib/LibXMLException.php
index ae136f57b..fb074f97d 100644
--- a/vendor/sabre/xml/lib/LibXMLException.php
+++ b/vendor/sabre/xml/lib/LibXMLException.php
@@ -8,7 +8,7 @@ use LibXMLError;
 use Throwable;
 
 /**
- * This exception is thrown when the Readers runs into a parsing error.
+ * This exception is thrown when the Reader runs into a parsing error.
  *
  * This exception effectively wraps 1 or more LibXMLError objects.
  *
diff --git a/vendor/sabre/xml/lib/ParseException.php b/vendor/sabre/xml/lib/ParseException.php
index 5980b5fc4..e237b8732 100644
--- a/vendor/sabre/xml/lib/ParseException.php
+++ b/vendor/sabre/xml/lib/ParseException.php
@@ -4,8 +4,7 @@ declare(strict_types=1);
 
 namespace Sabre\Xml;
 
-use
-    Exception;
+use Exception;
 
 /**
  * This is a base exception for any exception related to parsing xml files.
diff --git a/vendor/sabre/xml/lib/Reader.php b/vendor/sabre/xml/lib/Reader.php
index 368e8ffd2..7871a74f5 100644
--- a/vendor/sabre/xml/lib/Reader.php
+++ b/vendor/sabre/xml/lib/Reader.php
@@ -56,7 +56,7 @@ class Reader extends XMLReader
     public function parse(): array
     {
         $previousEntityState = null;
-        $shouldCallLibxmlDisableEntityLoader = (\PHP_VERSION_ID < 80000);
+        $shouldCallLibxmlDisableEntityLoader = (\LIBXML_VERSION < 20900);
         if ($shouldCallLibxmlDisableEntityLoader) {
             $previousEntityState = libxml_disable_entity_loader(true);
         }
@@ -92,11 +92,11 @@ class Reader extends XMLReader
 
     /**
      * parseGetElements parses everything in the current sub-tree,
-     * and returns a an array of elements.
+     * and returns an array of elements.
      *
      * Each element has a 'name', 'value' and 'attributes' key.
      *
-     * If the the element didn't contain sub-elements, an empty array is always
+     * If the element didn't contain sub-elements, an empty array is always
      * returned. If there was any text inside the element, it will be
      * discarded.
      *
@@ -249,7 +249,7 @@ class Reader extends XMLReader
      *
      * If the attributes are part of the same namespace, they will simply be
      * short keys. If they are defined on a different namespace, the attribute
-     * name will be retured in clark-notation.
+     * name will be returned in clark-notation.
      */
     public function parseAttributes(): array
     {
@@ -275,7 +275,7 @@ class Reader extends XMLReader
 
     /**
      * Returns the function that should be used to parse the element identified
-     * by it's clark-notation name.
+     * by its clark-notation name.
      */
     public function getDeserializerForElementName(string $name): callable
     {
diff --git a/vendor/sabre/xml/lib/Service.php b/vendor/sabre/xml/lib/Service.php
index 596c93cc4..a8e34d254 100644
--- a/vendor/sabre/xml/lib/Service.php
+++ b/vendor/sabre/xml/lib/Service.php
@@ -7,7 +7,7 @@ namespace Sabre\Xml;
 /**
  * XML parsing and writing service.
  *
- * You are encouraged to make a instance of this for your application and
+ * You are encouraged to make an instance of this for your application and
  * potentially extend it, as a central API point for dealing with xml and
  * configuring the reader and writer.
  *
@@ -117,7 +117,7 @@ class Service
             $input = (string) stream_get_contents($input);
         }
 
-        // If input is empty, then its safe to throw exception
+        // If input is empty, then it's safe to throw an exception
         if (empty($input)) {
             throw new ParseException('The input element to parse is empty. Do not attempt to parse');
         }
@@ -161,7 +161,7 @@ class Service
             $input = (string) stream_get_contents($input);
         }
 
-        // If input is empty, then its safe to throw exception
+        // If input is empty, then it's safe to throw an exception
         if (empty($input)) {
             throw new ParseException('The input element to parse is empty. Do not attempt to parse');
         }
@@ -217,9 +217,9 @@ class Service
     }
 
     /**
-     * Map an xml element to a PHP class.
+     * Map an XML element to a PHP class.
      *
-     * Calling this function will automatically setup the Reader and Writer
+     * Calling this function will automatically set up the Reader and Writer
      * classes to turn a specific XML element to a PHP class.
      *
      * For example, given a class such as :
diff --git a/vendor/sabre/xml/lib/Version.php b/vendor/sabre/xml/lib/Version.php
index d4e465de9..1144bf085 100644
--- a/vendor/sabre/xml/lib/Version.php
+++ b/vendor/sabre/xml/lib/Version.php
@@ -16,5 +16,5 @@ class Version
     /**
      * Full version number.
      */
-    const VERSION = '2.2.3';
+    const VERSION = '2.2.5';
 }
diff --git a/vendor/sabre/xml/lib/XmlSerializable.php b/vendor/sabre/xml/lib/XmlSerializable.php
index b22f8d5e8..2affc33f1 100644
--- a/vendor/sabre/xml/lib/XmlSerializable.php
+++ b/vendor/sabre/xml/lib/XmlSerializable.php
@@ -20,7 +20,7 @@ interface XmlSerializable
      * Use the $writer argument to write its own xml serialization.
      *
      * An important note: do _not_ create a parent element. Any element
-     * implementing XmlSerializble should only ever write what's considered
+     * implementing XmlSerializable should only ever write what's considered
      * its 'inner xml'.
      *
      * The parent of the current element is responsible for writing a
diff --git a/vendor/sabre/xml/phpstan.neon b/vendor/sabre/xml/phpstan.neon
deleted file mode 100644
index d6dd4e577..000000000
--- a/vendor/sabre/xml/phpstan.neon
+++ /dev/null
@@ -1,6 +0,0 @@
-parameters:
-  level: 5
-  ignoreErrors:
-    -
-      message: '!Parameter #3 \$uri of method XMLWriter::startElementNs\(\) expects string, null given.!'
-      path: lib/Writer.php