build.yml in lbfgsb-0.4.1

- old
+ new

@@ -9,13 +9,11 @@
       matrix:
         ruby: [ '2.6', '2.7', '3.0' ]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby ${{ matrix.ruby }}
-        uses: actions/setup-ruby@v1
+        uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
       - name: Build and test with Rake
-        run: |
-          gem install --no-document bundler
-          bundle install --jobs 4 --retry 3
-          bundle exec rake
+        run: bundle exec rake