Update dependency phpunit/phpunit to v12.1.4

Author: renovate[bot]

composer.json

@@ -7,7 +7,7 @@
         "php": "^7.4 || ^8.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "12.0.8",
+        "phpunit/phpunit": "12.1.4",
         "squizlabs/php_codesniffer": "3.10.0"
     },
     "config": {