Update testing matrix to exclude Laravel 9

Removed Laravel version 9 from the testing matrix.

Author: barryvdh

.github/workflows/run-tests.yml

@@ -21,17 +21,13 @@ jobs:
       fail-fast: false
       matrix:
         php: [8.5, 8.4, 8.3, 8.2, 8.1]
-        laravel: [^12, ^11, ^10, ^9]
+        laravel: [^12, ^11, ^10]
         dependency-version: [prefer-stable]
         exclude:
           - laravel: ^12
             php: 8.1
           - laravel: ^11
             php: 8.1
-          - laravel: ^9
-            php: 8.4
-          - laravel: ^9
-            php: 8.5
 
     name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.dependency-version }}