Update phpunit/phpunit requirement from ^8.5.29 || ^9 to ^11.5.1

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

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

composer.json

@@ -13,7 +13,7 @@
         "ircmaxell/random-lib": "^1.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.5.29 || ^9"
+        "phpunit/phpunit": "^11.5.1"
     },
     "license": "MIT",
     "autoload":{