Change ruby-3-4 to release (#161)

Author: teoljungberg

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.0", "3.1", "3.2", "3.3", "3.4.0-preview2"]
+        ruby: ["3.0", "3.1", "3.2", "3.3", "3.4"]
         rails: ["7.0", "7.1", "7.2", "8.0.0"]
         continue-on-error: [false]