message: workflows/automate_merge_message: fix diff point
diff: @@ -25,7 +25,7 @@ jobs:
  steps:
  - uses: actions/checkout@v3
  with:
  - ref: '${{ github.event.pull_request.merge_commit_sha }}'
  + ref: '${{ github.event.pull_request.head.sha }}'
  - name: fetch base
  run: git fetch --depth 1 origin ${{ github.event.pull_request.base.sha }}
  