Add Ruby 3.4 to the GitHub Actions matrix

Author: mvz

.github/workflows/ruby.yml

@@ -27,7 +27,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ["3.0", "3.1", "3.2", "3.3"]
+        ruby: ["3.0", "3.1", "3.2", "3.3", "3.4"]
 
     steps:
       - uses: actions/checkout@v4