Update phpro/grumphp requirement from ^0.17.2 to ^0.18.0

Updates the requirements on phpro/grumphp to permit the latest version.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

composer.json

@@ -17,7 +17,7 @@
         "vimeo/psalm": "^3.8",
         "phpmd/phpmd": "^2.8",
         "squizlabs/php_codesniffer": "^3.5",
-        "phpro/grumphp": "^0.17.2"
+        "phpro/grumphp": "^0.18.0"
     },
     "license": "MIT",
     "authors": [