Update dependency phpstan/phpstan-phpunit to v2

| datasource | package                 | from  | to    |
| ---------- | ----------------------- | ----- | ----- |
| packagist  | phpstan/phpstan-phpunit | 1.4.0 | 2.0.0 |

Author: renovate[bot]

composer.json

@@ -15,7 +15,7 @@
     },
     "require-dev": {
         "phpstan/phpstan": "^1.12.9",
-        "phpstan/phpstan-phpunit": "^1.4.0",
+        "phpstan/phpstan-phpunit": "^2.0.0",
         "phpstan/phpstan-strict-rules": "^1.6.1",
         "phpunit/phpunit": "^11.4.3",
         "slam/php-cs-fixer-extensions": "^3.12.0",