Update phpunit/phpunit requirement from 9.* to 11.*

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/11.2.9/ChangeLog-11.2.md)
- [Commits](sebastianbergmann/phpunit@9.0.0...11.2.9)

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

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

composer.json

@@ -30,7 +30,7 @@
         "symfony/finder": "^5.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "9.*",
+        "phpunit/phpunit": "11.*",
         "phpstan/phpstan": "1.*"
     },
     "autoload": {