Add option for PHPUnit 12 dependency

Author: olivervogel

composer.json

@@ -24,7 +24,7 @@
         "intervention/gif": "^4.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "^10.0 || ^11.0",
+        "phpunit/phpunit": "^10.0 || ^11.0 || ^12.0",
         "mockery/mockery": "^1.6",
         "phpstan/phpstan": "^2.1",
         "squizlabs/php_codesniffer": "^3.8",