fix: add signoff

Signed-off-by: emirot <emirot.nolan@gmail.com>

Author: emirot

.github/workflows/update-gitops-promoter-version.yaml

@@ -129,6 +129,7 @@ jobs:
           path: current-repo
           commit-message: "chore: update GitOps Promoter to ${{ steps.get-latest-release.outputs.latest_version }}"
           title: "chore: update GitOps Promoter to ${{ steps.get-latest-release.outputs.latest_version }}"
+          signoff: 'true'
           body: |
             This PR updates GitOps Promoter from ${{ steps.get-current-version.outputs.current_version }} to ${{ steps.get-latest-release.outputs.latest_version }}.