Fix Laravel version

Author: Alex Garrett-Smith

.github/workflows/run-tests.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest]
         php: [8.0]
-        laravel: [8.*]
+        laravel: [9.*]
         stability: [prefer-lowest, prefer-stable]
         include:
           - laravel: 8.*