Update dependency phpunit/phpunit to v12

| datasource | package         | from    | to     |
| ---------- | --------------- | ------- | ------ |
| packagist  | phpunit/phpunit | 11.5.49 | 12.5.8 |

Author: renovate[bot]

composer.json

@@ -18,7 +18,7 @@
         "doctrine/coding-standard":               "^14.0.0",
         "ext-zip":                                "^1.15.0",
         "roave/infection-static-analysis-plugin": "^1.39.0",
-        "phpunit/phpunit":                        "^11.5.44",
+        "phpunit/phpunit":                        "^12.5.8",
         "psalm/plugin-phpunit":                   "^0.19.5",
         "vimeo/psalm":                            "^6.13.1"
     },