Update phpunit/phpunit requirement from ^9.5.5 to ^9.5.23

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/main/ChangeLog-9.5.md)
- [Commits](sebastianbergmann/phpunit@9.5.5...9.5.23)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -88,7 +88,7 @@
         "phpstan/phpstan-deprecation-rules": "^1.0",
         "phpstan/phpstan-phpunit": "^1.0",
         "phpstan/phpstan-strict-rules": "^1.0",
-        "phpunit/phpunit": "^9.5.5",
+        "phpunit/phpunit": "^9.5.23",
         "rector/rector": "^0.14",
         "roave/security-advisories": "dev-latest",
         "symfony/browser-kit": "^5.4|^6.0",