ci: Bump Ruby to 3.4

Author: sorairolake

.github/workflows/CD.yaml

@@ -27,7 +27,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.3
+          ruby-version: 3.4
       - name: Install Asciidoctor
         run: |
           gem install asciidoctor