Merge pull request #186 from reload/dependabot/composer/main/phpro/grumphp-shim-2.9.0

Author: dependabot[bot]

composer.json

@@ -21,7 +21,7 @@
     },
     "require-dev": {
         "phpstan/phpstan": "^1",
-        "phpro/grumphp-shim": "^1.5",
+        "phpro/grumphp-shim": "^2.9",
         "squizlabs/php_codesniffer": "^3.6",
         "thecodingmachine/phpstan-safe-rule": "^1.2",
         "phpstan/extension-installer": "^1.3",