Update to Laravel framework ^9.1

Author: joelhinz

composer.json

@@ -3,8 +3,8 @@
   "description": "An easy way of quickly sending messages to predefined Slack endpoints within a Laravel project.",
   "type": "library",
   "require": {
-    "guzzlehttp/guzzle": "^7.0|^7.1|^7.2|^7.3|^7.4",
-    "illuminate/support": "^5.0|^6.0|^7.0|^8.0|^8.1|^9.0"
+    "guzzlehttp/guzzle": "^7.0",
+    "laravel/framework": "^9.1"
   },
   "license": "MIT",
   "authors": [