Update non-example GitHub Workflows to ignore "push" actions to "dependabot/**" branches because these are also associated with a "pull_request".

.github/workflows/checkers.yml

@@ -3,6 +3,8 @@ name: Checkers
 on:
   pull_request:
   push:
+    branches-ignore:
+      - 'dependabot/**'
   schedule:
   - cron: '30 12 * * *'
   workflow_dispatch: