Apply suggestion from @swissspidy

Author: swissspidy

composer.json

@@ -15,7 +15,7 @@
         "php-parallel-lint/php-console-highlighter": "^1.0",
         "php-parallel-lint/php-parallel-lint": "^1.3.1",
         "phpcompatibility/php-compatibility": "^10.0",
-        "slevomat/coding-standard": "^7.0",
+        "slevomat/coding-standard": "^7.0 || ^8.0",
         "phpstan/extension-installer": "^1.4",
         "phpstan/phpstan": "^1.12.26 || ^2.0",
         "phpstan/phpstan-deprecation-rules": "^1.2 || ^2.0",