ci: add dependabot automerge workflow

Author: andrewthetechie

.github/workflows/dependabot-auto-merge.yml

@@ -7,7 +7,7 @@ jobs:
   auto-merge:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.1.4
+      - uses: actions/checkout@v3
       - uses: ahmadnassri/action-dependabot-auto-merge@v2
         with:
           target: minor