chore(ci): automerge fix (#568)

Author: fclairamb

.github/workflows/automerge.yml

@@ -32,3 +32,4 @@ jobs:
         uses: pascalgn/automerge-action@v0.16.4
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          MERGE_METHOD: "squash"