Use cache v2

Author: jenky

.github/workflows/testing.yml

@@ -34,7 +34,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Cache dependencies
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: ~/.composer/cache/files
           key: dependencies-laravel-${{ matrix.laravel }}-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}