test: Update to phpunit 12

Author: Stephan Wentz

composer.json

@@ -24,7 +24,7 @@
         "squizlabs/php_codesniffer": "^3.9"
     },
     "require-dev": {
-        "phpunit/phpunit": "^10.5"
+        "phpunit/phpunit": "^12.0.5"
     },
     "scripts": {
         "tests": [