Update backport.yml

Author: Write

.github/workflows/backport.yml

@@ -11,7 +11,6 @@ jobs:
   backport:
     name: Backport pull request
     runs-on: ubuntu-latest
-
     # Only run when pull request is merged
     # or when a comment starting with `/backport` is created by someone other than the
     # https://github.com/backport-action bot user (user id: 97796249). Note that if you use your
@@ -30,3 +29,5 @@ jobs:
       - uses: actions/checkout@v4
       - name: Create backport pull requests
         uses: korthout/backport-action@v4
+        with:
+          auto_merge_enabled: true