Update phpunit/phpunit requirement from ^10.5 to ^11.4

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/11.4.2/ChangeLog-11.4.md)
- [Commits](sebastianbergmann/phpunit@10.5.0...11.4.2)

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

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

composer.json

@@ -26,7 +26,7 @@
     "infection/infection": "*",
     "lcobucci/clock": "^3.0",
     "phpstan/phpstan": "*",
-    "phpunit/phpunit": "^10.5",
+    "phpunit/phpunit": "^11.4",
     "roave/security-advisories": "dev-latest"
   },
   "autoload": {