ci: add automerge label to create PR step

.github/workflows/deployment-weekly-release.yml

@@ -38,6 +38,7 @@ jobs:
           old_string: "**This is an automatic release**.<br/>Manual action may be required for major bumps.<br/>Detected change to be ``${{ steps.semver.outputs.bump }}``<br/>Bump version from ``${{ steps.semver.outputs.current }}`` to ``${{ steps.semver.outputs.next }}``"
           source_branch: dev
           target_branch: main
+          label: "automerge"
       - name: Discord notification
         env:
           DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}