Use caching during CI

.github/workflows/ruby.yml

@@ -6,7 +6,7 @@
 # This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
 # For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
 
-name: Ruby
+name: Tests
 
 on:
   push:
@@ -21,19 +21,17 @@ jobs:
       matrix:
         rspec-minor-versions: [6, 7, 8, 9, 10, 11, 12, 13]
         ruby-versions: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3"]
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/rspec_3.${{ matrix.rspec-minor-versions }}.gemfile
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-versions }}
-
-      - name: install bundle
-        env:
-          BUNDLE_GEMFILE: gemfiles/rspec_3.${{ matrix.rspec-minor-versions }}.gemfile
-        run: bundle install
+          bundler-cache: true
 
       - name: Run tests
         run: bundle exec rake