test against Ruby 3.4

Author: yukideluxe

.github/workflows/ruby.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['3.1', '3.2', '3.3', 'jruby-9.4']
+        ruby-version: ['3.1', '3.2', '3.3', '3.4', 'jruby-9.4']
 
     steps:
     - uses: actions/checkout@v4