Update dependency phpunit/phpunit to v12

Author: renovate[bot]

composer.json

@@ -108,7 +108,7 @@
         "phpstan/phpstan-phpunit": "^2.0",
         "phpstan/phpstan-strict-rules": "^2.0",
         "phpstan/phpstan-symfony": "^2.0",
-        "phpunit/phpunit": "11.5.*",
+        "phpunit/phpunit": "12.0.*",
         "roave/security-advisories": "dev-latest",
         "slevomat/coding-standard": "^8.15",
         "squizlabs/php_codesniffer": "^3.9",