add Ruby 3.4 to the test suite

Author: GrantBirki

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby_version: ["3.1", "3.2", "3.3"]
+        ruby_version: ["3.1", "3.2", "3.3", "3.4"]
 
     steps:
       - uses: actions/checkout@v4