Update dependency phpunit/phpunit to v12

Author: renovate[bot]

composer.json

@@ -30,7 +30,7 @@
         "roave/security-advisories": "dev-latest",
         "squizlabs/php_codesniffer": "^3.6",
         "phpmd/phpmd": "^2.14",
-        "phpunit/phpunit": "^9.5",
+        "phpunit/phpunit": "^12.0",
         "phpstan/phpstan": "^2.0",
         "phpstan/phpstan-phpunit": "^2.0",
         "phpstan/phpstan-strict-rules": "^2.0",