Drop testing Ruby 2.4.

ioquatix · ioquatix · commit 06c6c1bd4f28 · 2024-05-07T22:43:40.000+12:00
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
@@ -19,7 +19,6 @@ jobs:
           - macos-11
           - windows-2022
         ruby:
-          - "2.4"
           - "2.5"
           - "2.6"
           - "2.7"
