Update dependency phpunit/phpunit to v12

| datasource | package         | from    | to      |
| ---------- | --------------- | ------- | ------- |
| packagist  | phpunit/phpunit | 11.5.42 | 12.3.15 |

Author: renovate[bot]

composer.json

@@ -32,7 +32,7 @@
         "laminas/laminas-validator": "^2.64.4",
         "phpstan/phpstan-deprecation-rules": "^2.0.3",
         "phpstan/phpstan-phpunit": "^2.0.7",
-        "phpunit/phpunit": "^11.5.42",
+        "phpunit/phpunit": "^12.3.15",
         "slam/php-cs-fixer-extensions": "^3.13.0"
     },
     "conflict": {