chore: use Ruby 3.4 as default for lint job

Author: cardmagic

.github/workflows/ruby.yml

@@ -25,7 +25,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: '3.4'
         bundler-cache: true
     - name: Run RuboCop
       run: bundle exec rubocop