add cache key

Author: joshmanders

.github/workflows/tests.yaml

@@ -34,6 +34,7 @@ jobs:
         uses: actions/cache@v3
         with:
           path: ~/.composer/cache/files
+          key: dependencies-laravel-${{ matrix.laravel }}-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2