use php 8.1

Author: Ikstar

composer.json

@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": "^7.2|~8.0.0",
+        "php": "^7.2|~8.0.0| ^8.1",
         "kreait/firebase-php": "^6.0",
         "illuminate/contracts": "^6.0|^7.0|^8.0",
         "illuminate/support": "^6.0|^7.0|^8.0"