Dropped explict phpunit/phpunit requirement

Author: PHLAK

composer.json

@@ -28,7 +28,6 @@
     "require-dev": {
         "phlak/coding-standards": "^4.0",
         "phpstan/phpstan": "^2.0",
-        "phpunit/phpunit": "^10.0 || ^11.0",
         "yoast/phpunit-polyfills": "^3.0"
     },
     "autoload": {