Update dependency phpunit/phpunit to v12

Author: renovate[bot]

composer.json

@@ -26,7 +26,7 @@
     },
     "require-dev": {
         "phpstan/phpstan": "^1.8.2",
-        "phpunit/phpunit": "^9.5.5 || ^10.0.0 || ^11.0.0",
+        "phpunit/phpunit": "^9.5.5 || ^10.0.0 || ^11.0.0 || ^12.0.0",
         "scrutinizer/ocular": "^1.8.1",
         "unleashedtech/php-coding-standard": "^3.1",
         "vimeo/psalm": "^4.7.3"