chore(deps): update dependency phpunit/phpunit to v12

Author: renovate[bot]

composer.json

@@ -19,6 +19,6 @@
       "symfony/http-foundation": "^4.4.9 || ^6.2.7"
     },
     "require-dev": {
-        "phpunit/phpunit": "7.5.20"
+        "phpunit/phpunit": "12.4.4"
     }
 }