Update Ruby version in GitHub actions

Author: kddnewton

.github/workflows/main.yml

@@ -30,7 +30,10 @@ jobs:
           - ubuntu-latest
           # - windows-latest
         ruby:
-          - 3.1
+          - 3.4
+          # - 3.3
+          # - 3.2
+          # - 3.1
           # - 3.0
           # - 2.7
     runs-on: ${{ matrix.os }}