ci.yml in attr_extras-7.0.0

- old
+ new

@@ -11,13 +11,13 @@
 
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        ruby-version: ["3.0", "2.7", "2.6", "2.5", "jruby-head"]
+        ruby-version: [3.1, "3.0", 2.7, jruby-head]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up Ruby ${{ matrix.ruby-version }}
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically