Udpated Github Actions to run latest setup-ruby action

Author: anero

.github/workflows/ci.yml

@@ -6,9 +6,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: ruby/setup-ruby@477b21f02be01bcb8030d50f37cfec92bfa615b6
+      - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7
+          ruby-version: 3.4
           bundler-cache: true
       - run: bundle install
       - run: bundle exec rspec