ACQE-9028: MFTF Upgrade phpunit from v10 to v12

Author: sandesh-shivakumar

composer.json

@@ -41,7 +41,7 @@
         "brainmaestro/composer-git-hooks": "^3.0",
         "php-coveralls/php-coveralls": "^1.0||^2.2",
         "phpmd/phpmd": "^2.8.0",
-        "phpunit/phpunit": "^10.0",
+        "phpunit/phpunit": "^12.0",
         "squizlabs/php_codesniffer": "~3.11.0"
     },
     "suggest": {