ci.yml in karafka-2.0.17

- old
+ new

@@ -107,9 +107,10 @@
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{matrix.ruby}}
+          bundler-cache: true
 
       - name: Install latest Bundler
         run: |
           gem install bundler --no-document
           gem update --system --no-document