Update dependency phpunit/phpunit to v12

Author: renovate[bot]

composer.json

@@ -16,7 +16,7 @@
     "require-dev": {
         "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
         "phpstan/phpstan": "^2.0",
-        "phpunit/phpunit": "^9 || ^10 || ^11",
+        "phpunit/phpunit": "^9 || ^10 || ^11 || ^12",
         "squizlabs/php_codesniffer": "^3.7"
     },
     "autoload": {