[ci] add Ruby 3.4 to matrix

Author: markets

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["3.3", "3.2", "3.1", "3.0", "2.7"]
+        ruby-version: ["3.4", "3.3", "3.2", "3.1", "3.0", "2.7"]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Ruby