bug #33035 [Lock] Fix return typehint (jderusse)

This PR was merged into the 5.0-dev branch.

Discussion
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[Lock] Fix return typehint

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | NA
| License       | MIT
| Doc PR        | NA

Return typehint added in https://github.com/symfony/symfony/pull/31996

ping @dFayet

Commits
-------

e28ffe8fdf Fix return typehint in Lock

src/Symfony/Component/Lock/Lock.php

@@ -67,7 +67,7 @@ final class Lock implements LockInterface, LoggerAwareInterface
     /**
      * {@inheritdoc}
      */
-    public function acquire($blocking = false): ?bool
+    public function acquire($blocking = false): bool
     {
         try {
             if ($blocking) {