Added support for slevomat/coding-standard:8.0 (#611)

Author: GuillaumeSMedia

composer.json

@@ -31,7 +31,7 @@
         "psr/container": "^1.0|^2.0",
         "psr/simple-cache": "^1.0|^2.0|^3.0",
         "sebastian/diff": "^4.0",
-        "slevomat/coding-standard": "^7.0.8",
+        "slevomat/coding-standard": "^7.0.8|^8.0",
         "squizlabs/php_codesniffer": "^3.5",
         "symfony/cache": "^4.4|^5.0|^6.0",
         "symfony/console": "^4.2|^5.0|^6.0",