ci(GitHub Actions): update ruby version

Author: codeout

.github/workflows/test-linux.yaml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['3.3', '3.2', '3.1']
+        ruby-version: ['3.4', 3.3', '3.2']
         os: [ubuntu-latest]
         experimental: [false]
         include: