switch from actions/setup-ruby to ruby/setup-ruby

Author: DannyBen

.github/workflows/test.yml

@@ -16,21 +16,11 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v2
 
-    - name: Cache gem dependencies
-      uses: actions/cache@v1
-      with:
-        path: vendor/bundle
-        key: ${{ runner.os }}-${{ matrix.ruby }}-bundle
-
     - name: Setup Ruby
       uses: actions/setup-ruby@v1
-      with: { ruby-version: '${{ matrix.ruby }}' }
-
-    - name: Bundle install
-      run: |
-        gem install bundler
-        bundle config path vendor/bundle
-        bundle install --jobs 4 --retry 3
+      with: 
+        ruby-version: '${{ matrix.ruby }}'
+        bundler-cache: true
 
     - name: Run tests
       run: bundle exec rspec