ci.yml in prometheus_exporter-2.1.1

- old
+ new

@@ -25,19 +25,20 @@
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/ar_${{ matrix.activerecord }}.gemfile
 
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.0', '3.1', '3.2', '3.3']
-        activerecord: [60, 61, 70]
+        ruby: ['3.1', '3.2', '3.3']
+        activerecord: [61, 70, 71]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
+          bundler: latest
           bundler-cache: true
 
       - name: Rubocop
         run: bundle exec rubocop
 
@@ -48,14 +49,14 @@
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     needs: build
     runs-on: ubuntu-latest
 
     outputs:
-      new_version_published: ${{ steps.release.outputs.new_version_published }}
+      new_version_published: ${{ steps.release.outputs.new_version }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Release gem
         id: release
         uses: discourse/publish-rubygems-action@v2
         env:
@@ -68,10 +69,10 @@
     if: needs.publish.outputs.new_version_published == 'true'
     runs-on: ubuntu-latest
     timeout-minutes: 20
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: docker/setup-qemu-action@v2
       - uses: docker/setup-buildx-action@v2
 
       - name: Set vars
         id: vars