Update phpunit/phpunit requirement from ^10.1 to ^11.5

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/11.5.2/ChangeLog-11.5.md)
- [Commits](sebastianbergmann/phpunit@10.1.0...11.5.2)

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

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

Author: dependabot[bot]

composer.json

@@ -9,7 +9,7 @@
         "symfony/process": "^5.4"
     },
     "require-dev": {
-        "phpunit/phpunit": "^10.1",
+        "phpunit/phpunit": "^11.5",
         "cakephp/cakephp-codesniffer": "^5.0"
     },
     "autoload": {