minor symfony#59397 [PhpUnitBridge] fix tests (xabbuh)

This PR was merged into the 7.3 branch.

Discussion
----------

[PhpUnitBridge] fix tests

| Q             | A
| ------------- | ---
| Branch?       | 7.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

Commits
-------

bf6d420 fix tests

Author: xabbuh

composer.json

@@ -203,6 +203,9 @@
         ]
     },
     "autoload-dev": {
+        "psr-4": {
+            "Symfony\\Bridge\\PhpUnit\\": "src/Symfony/Bridge/PhpUnit/"
+        },
         "files": [
             "src/Symfony/Component/Clock/Resources/now.php",
             "src/Symfony/Component/VarDumper/Resources/functions/dump.php"