minor #63566 [Messenger] Make $clock nullable in PostgreSqlNotifyOnIdleListener (nicolas-grekas)

This PR was merged into the 8.1 branch.

Discussion
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[Messenger] Make $clock nullable in PostgreSqlNotifyOnIdleListener

| Q             | A
| ------------- | ---
| Branch?       | 8.1
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

This makes conditional wiring easier, as spotted in doctrine/DoctrineBundle#2204

Commits
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52e6cd3f1de [Messenger] Make $clock nullable in PostgreSqlNotifyOnIdleListener

Author: nicolas-grekas

Handler/Acknowledger.php

@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Messenger\Handler;
 
-use Psr\Clock\ClockInterface;
 use Symfony\Component\Clock\Clock;
+use Symfony\Component\Clock\ClockInterface;
 use Symfony\Component\Messenger\Exception\LogicException;
 
 /**

Handler/BatchHandlerTrait.php

@@ -11,8 +11,8 @@
 
 namespace Symfony\Component\Messenger\Handler;
 
-use Psr\Clock\ClockInterface;
 use Symfony\Component\Clock\Clock;
+use Symfony\Component\Clock\ClockInterface;
 
 /**
  * @author Nicolas Grekas <p@tchwork.com>