Update phpunit/phpunit requirement from ^10.1.0 to ^11.5.0

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/11.5.0/ChangeLog-11.5.md)
- [Commits](sebastianbergmann/phpunit@10.1.0...11.5.0)

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

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

composer.json

@@ -19,7 +19,7 @@
         "cakephp/cakephp-codesniffer": "^5.0",
         "cakephp/debug_kit": "^5.0.0",
         "josegonzalez/dotenv": "^4.0",
-        "phpunit/phpunit": "^10.1.0"
+        "phpunit/phpunit": "^11.5.0"
     },
     "suggest": {
         "cakephp/repl": "Console tools for a REPL interface for CakePHP applications.",