Update dependency phpunit/phpunit to v12

| datasource | package         | from    | to     |
| ---------- | --------------- | ------- | ------ |
| packagist  | phpunit/phpunit | 11.5.15 | 12.1.1 |

Author: renovate[bot]

composer.json

@@ -49,7 +49,7 @@
         "phpstan/phpstan-strict-rules": "^2.0.4",
         "phpstan/phpstan-symfony": "^2.0.3",
         "phpstan/phpstan-webmozart-assert": "^2.0.0",
-        "phpunit/phpunit": "^11.5.15",
+        "phpunit/phpunit": "^12.1.1",
         "roave/security-advisories": "dev-master",
         "symfony/config": "^6.4 || ^7.2",
         "symfony/options-resolver": "^6.4 || ^7.2",