Allow usage with symfony/config v8

Author: W0rma

composer.json

@@ -30,7 +30,7 @@
     },
     "require": {
         "php": "^7.4|^8.0",
-        "symfony/config": "^5.4|^6.4|^7.0",
+        "symfony/config": "^5.4|^6.4|^7.0|^8.0",
         "symfony/dependency-injection": "^5.4|^6.4|^7.0|^8.0",
         "symfony/deprecation-contracts": "^2.1|^3.0",
         "symfony/event-dispatcher": "^5.4|^6.4|^7.0|^8.0",