chore(CI): use bundler-cache: true (#116)

Author: olleolleolle

.github/workflows/ci.yml

@@ -28,19 +28,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
-      - name: Update rubygems
-        run: |
-          gem update --system
-      - uses: actions/cache@v3
-        with:
-          path: vendor/bundle
-          key: bundle-use-ruby-${{ matrix.ruby }}-${{ hashFiles('**/Gemfile.lock') }}
-          restore-keys: |
-            bundle-use-ruby-${{ matrix.ruby }}-
-      - name: Bundle install
-        run: |
-          bundle config path vendor/bundle
-          bundle install --jobs 4 --retry 3
+          bundler-cache: true # 'bundle install' and cache gems
       - name: Run specs
         env:
           SIMPLECOV: ${{ matrix.coverage }}