Add ruby 3.4 to the CI target (#181)

Signed-off-by: moznion <moznion@mail.moznion.net>

Author: moznion

.github/workflows/ci.yaml

@@ -14,6 +14,7 @@ jobs:
           - "3.1"
           - "3.2"
           - "3.3"
+          - "3.4"
           - ruby-head
     runs-on: ${{ matrix.os }}
     steps: