ISSUE-19: PHPUnit 12 support

Author: robiningelbrecht

composer.json

@@ -19,7 +19,7 @@
     "php": "^8.1",
     "ext-simplexml": "*",
     "ext-xmlreader": "*",
-    "phpunit/phpunit": "^10.3||^11.0",
+    "phpunit/phpunit": "^10.3||^11.0||^12.0",
     "symfony/console": "^5.4||^6.2||^7.0"
   },
   "autoload": {