Update Ruby version.

Author: majjoha

.github/workflows/ci.yml

@@ -11,6 +11,6 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7
+          ruby-version: 3.4.5
           bundler-cache: true
       - run: bundle exec rspec