* 6.4:
  Remove unneeded use statements
  Redundant assignment to promoted property
  Revert "[Messenger] Add call to `gc_collect_cycles()` after each message is handled"

…ic in $notByRef

…pecific logic in $notByRef (Hakayashii, denjas)

This PR was squashed before being merged into the 6.4 branch.

Discussion
----------

[VarExporter] Fix: Use correct closure call for property-specific logic in $notByRef

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix #...
| License       | MIT

Previously, $notByRef was treated as a callable instead of an array of closures. Now, the closure is correctly invoked with $notByRef[$name]($object, $value) if it's not true.

Encountered the following error after loading an entity from the database using Doctrine, which held a reference to another entity. The error occurred when modifying this lazily-loaded reference.
```
[critical] Uncaught Error: Array callback must have exactly two elements

In Hydrator.php line 163:

  [Error]
  Array callback must have exactly two elements

Exception trace:
  at C:\Users\hakayashii\repos\test\vendor\symfony\var-exporter\Internal\Hydrator.php:163
 Proxies\__CG__\App\Entity\Subscription->{closure:Symfony\Component\VarExporter\Internal\Hydrator::getSimpleHydrator():155}() at C:\Users\hakayashii\repos\test\vendor\symfony\var-exporter\Hydrator.php:72
 Symfony\Component\VarExporter\Hydrator::hydrate() at C:\Users\hakayashii\repos\test\vendor\symfony\var-exporter\Internal\LazyObjectState.php:56
 Symfony\Component\VarExporter\Internal\LazyObjectState->initialize() at C:\Users\hakayashii\repos\test\vendor\symfony\var-exporter\LazyGhostTrait.php:146
 Proxies\__CG__\App\Entity\Subscription->__get() at C:\Users\hakayashii\repos\test\src\Service\OrderBuilder.php:45
[...]
```

Commits
-------

b1f06026179 [VarExporter] Fix: Use correct closure call for property-specific logic in $notByRef

* 6.4:
  add translations for the Twig constraint
  drop the Date header using the Postmark API transport
  [VarExporter] Fix: Use correct closure call for property-specific logic in $notByRef
  Unnecessary cast, return, semicolon and comma
  [Notifier] [Discord] Fix value limits
  Fix ServiceMethodsSubscriberTrait for nullable service

* 6.4:
  [Validator] add pl translation for the Twig constraint
  dump default value for property hooks if present