Increase PHPUnit version to 12

Author: alexander-schranz

composer.json

@@ -17,7 +17,7 @@
         "symfony/framework-bundle": "^5.4 || ^6.0 || ^7.0 || ^8.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.6 || ^10.0 || ^11.0",
+        "phpunit/phpunit": "^9.6 || ^10.0 || ^11.0 || ^12.0",
         "matthiasnoback/symfony-dependency-injection-test": "^5.1 || ^6.0",
         "phpspec/prophecy": "^1.14",
         "phpspec/prophecy-phpunit": "^2.0"