minor symfony#52360 [Messenger] fix tests (xabbuh)

This PR was merged into the 6.3 branch.

Discussion
----------

[Messenger] fix tests

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

Commits
-------

eed36c8 fix tests

Author: xabbuh

src/Symfony/Component/Messenger/Bridge/Doctrine/Transport/Connection.php

@@ -352,8 +352,8 @@ private function createAvailableMessagesQueryBuilder(): QueryBuilder
                 $now,
             ], [
                 Types::STRING,
-                Types::DATETIME_MUTABLE,
-                Types::DATETIME_MUTABLE,
+                Types::DATETIME_IMMUTABLE,
+                Types::DATETIME_IMMUTABLE,
             ]);
     }