Update korthout/backport-action action to v3.4.1 (#16215)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/backport.yml

@@ -25,7 +25,7 @@ jobs:
           token: ${{ secrets.BACKPORT_ACTION_GITHUB_PAT }}
 
       - name: Create backport PR
-        uses: korthout/backport-action@ca4972adce8039ff995e618f5fc02d1b7961f27a # v3.3.0
+        uses: korthout/backport-action@d07416681cab29bf2661702f925f020aaa962997 # v3.4.1
         with:
           github_token: ${{ secrets.BACKPORT_ACTION_GITHUB_PAT }}
           # Config README: https://github.com/korthout/backport-action#backport-action