chore: add ruby 3.4 (#512)

Author: route

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.7, "3.0", 3.1, 3.2, 3.3]
+        ruby: ["2.7", "3.0", "3.1", "3.2", "3.3", "3.4"]
     runs-on: ubuntu-latest
     env:
       FERRUM_PROCESS_TIMEOUT: 25