ci: update ruby version

Author: soumyamahunt

.github/workflows/cd.yml

@@ -63,7 +63,7 @@ jobs:
     - name: Setup Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.7
+        ruby-version: 3
 
     - name: Setup repository
       uses: SwiftyLab/ci/actions/setup@main