Add Ruby 3.4 to the test matrix

Author: smortex

.github/workflows/ci.yml

@@ -33,6 +33,7 @@ jobs:
           - "3.1"
           - "3.2"
           - "3.3"
+          - "3.4"
     name: Ruby ${{ matrix.ruby }}
     steps:
       - uses: actions/checkout@v5