Update dependency phpunit/phpunit to v12

Author: renovate[bot]

composer.json

@@ -25,7 +25,7 @@
         "phpstan/phpstan-phpunit": "^2.0",
         "phpstan/phpstan-strict-rules": "^2.0",
         "phpstan/extension-installer": "^1.4",
-        "phpunit/phpunit": "^10.5 || ^11.5",
+        "phpunit/phpunit": "^10.5 || ^11.5 || ^12.0",
         "roave/security-advisories": "dev-latest"
     },
     "scripts": {