Update dependency phpunit/phpunit to v12

| datasource | package         | from    | to     |
| ---------- | --------------- | ------- | ------ |
| packagist  | phpunit/phpunit | 11.5.11 | 12.0.6 |

Author: renovate[bot]

composer.json

@@ -29,7 +29,7 @@
         "phpstan/phpstan-deprecation-rules": "^2.0",
         "phpstan/phpstan-phpunit": "^2.0",
         "phpstan/phpstan-strict-rules": "^2.0",
-        "phpunit/phpunit": "^11.4",
+        "phpunit/phpunit": "^12.0",
         "twig/twig": "^3.16"
     },
     "suggest": {