Add PHP 8.1 and Laravel 9 to test matrix

Author: ksassnowski

.github/workflows/run-tests.yml

@@ -7,12 +7,14 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        php: [8.0]
-        laravel: [8.*]
+        php: ["8.0", "8.1"]
+        laravel: [8.*, 9.*]
         dependency-version: [prefer-lowest, prefer-stable]
         include:
           - laravel: 8.*
             testbench: ^6.17
+          - laravel: 9.*
+            testbench: ^7.6
         os: [ubuntu-latest]
 
     name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.dependency-version }} - ${{ matrix.os }}