Fix error bundling in CI with Ruby 4

Author: timriley

.github/workflows/ci.yml

@@ -31,12 +31,7 @@ jobs:
       uses: ruby/setup-ruby@v1
       with:
         ruby-version: "${{matrix.ruby}}"
-    - name: Install latest bundler
-      run: |
-        gem install bundler --no-document
-        bundle config set without 'tools benchmarks docs'
-    - name: Bundle install
-      run: bundle install --jobs 4 --retry 3
+        bundler-cache: true
     - name: Run all tests
       run: bundle exec rake
     - name: Run codacy-coverage-reporter