update cache action (#107)

Author: edalzell

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
             path: ~/.composer/cache/files
             key: dependencies-laravel-${{ matrix.laravel }}-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}