fix!: upgrade Ruby to 3.4 in CI/benchmark as well

Author: nickysn

.github/workflows/ci.yml

@@ -75,7 +75,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.2'
+          ruby-version: '3.4'
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@stable
       - name: Install Ruby dependencies