Update dependency phpunit/phpunit to v12

| datasource | package         | from   | to     |
| ---------- | --------------- | ------ | ------ |
| packagist  | phpunit/phpunit | 11.5.7 | 12.3.3 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

composer.json

@@ -28,7 +28,7 @@
     "phpbench/phpbench": "^1.2.15",
     "phpspec/prophecy-phpunit": "^2.1.0",
     "phpstan/phpstan": "^2.1.2",
-    "phpunit/phpunit": "^11.5.3",
+    "phpunit/phpunit": "^12.0.0",
     "psalm/plugin-phpunit": "^0.19.0",
     "roave/infection-static-analysis-plugin": "^1.34.0",
     "symfony/var-dumper": "^5.4.29|^6.4.0|^7.0.0",