Build on Ruby 3.4.

Author: gkellogg

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.0', 3.1, 3.2, 3.3, ruby-head, jruby]
+        ruby: ['3.0', 3.1, 3.2, 3.3, 3.4, ruby-head, jruby]
     steps:
       - name: Clone repository
         uses: actions/checkout@v3