chore: add Laravel 9 support

Author: mxschll

composer.json

@@ -14,8 +14,8 @@
     "require": {
         "php": ">=7.2",
         "guzzlehttp/guzzle": "^6.5 || ^7.0",
-        "illuminate/notifications": "~5.5 || ~6.0 || ~7.0 || ^8.0",
-        "illuminate/support": "~5.5 || ~6.0 || ~7.0 || ^8.0"
+        "illuminate/notifications": "~5.5 || ~6.0 || ~7.0 || ^8.0 || ^9.0",
+        "illuminate/support": "~5.5 || ~6.0 || ~7.0 || ^8.0 || ^9.0"
     },
     "require-dev": {
         "mockery/mockery": "^1.3",
@@ -45,4 +45,4 @@
             ]
         }
     }
-}
+}