chore: don't use 5.0.0 for now

Author: gsdevme

composer.json

@@ -7,7 +7,7 @@
         "phpstan/phpstan-strict-rules": "@stable",
         "phpmd/phpmd": "@stable",
         "squizlabs/php_codesniffer": "@stable",
-        "slevomat/coding-standard": "@stable"
+        "slevomat/coding-standard": "<5.0.0"
     },
     "provide": {
         "phpstan/phpstan": "*"