Merge branch 'uniqueness-validation-postgresql-arrays'

When setting an array column (or other PostgreSQL-specific data type)
to be validated for uniqueness, the resulting SQL query is generated with
syntax errors, like this:

    SELECT 1 AS one FROM "postgresql_arrays"
    WHERE "postgresql_arrays"."nicknames" = '["john", "johnny"]' LIMIT 1

This happens because Ruby Arrays must be type-casted to their PostgreSQL
equivalent. This small patch fixes this issue, calling the adapter's
type_cast method.

Closes #8077

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