Do not test ruby 3.4 on Rails 6.1

Author: andrehjr

.github/workflows/ci.yml

@@ -9,6 +9,9 @@ jobs:
         ruby: ["3.4", "3.3", "3.2", "3.1", "3.0", "2.7"]
         rails: ["8.0", "7.2", "7.1", "6.1"]
         exclude:
+          - rails: "6.1"
+            ruby: "3.4"
+
           - rails: "7.2"
             ruby: "2.7"
           - rails: "7.2"