composer(deps-dev): update phpunit/phpunit requirement

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-9.5.md)
- [Commits](sebastianbergmann/phpunit@9.5.2...9.5.3)

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -30,7 +30,7 @@
     "phpstan/phpstan-deprecation-rules": "^0.12.6",
     "phpstan/phpstan-phpunit": "^0.12.18",
     "phpstan/phpstan-strict-rules": "^0.12.9",
-    "phpunit/phpunit": "^9.5.2"
+    "phpunit/phpunit": "^9.5.3"
   },
   "config": {
     "platform": {