Update auto-backport.yml (#23340)

.github/workflows/auto-backport.yml

@@ -61,10 +61,10 @@ jobs:
         if: ${{ steps.create_backport_pull_request.outputs.has-conflicts == 'true' }}
         with:
           include-log: false
-          message: could not create a backport due to conflicts ${{ github.event.pull_request.user.login }}
+          message: could not create a backport due to conflicts
 
       - uses: ./.github/actions/notify-pull-request
         if: ${{ failure() }}
         with:
           include-log: true
-          message: something went wrong while creating a backport ${{ github.event.pull_request.user.login }}
+          message: something went wrong while creating a backport