fix: make PR_LABELS in sync with workflow name (#13)

.github/workflows/sync-client.yml

@@ -20,6 +20,7 @@ jobs:
         with:
           GH_PAT: ${{ secrets.GH_PAT }}
           CONFIG_PATH: .github/${{ github.workflow }}.yml
+          PR_LABELS: ${{ github.workflow }}
           ASSIGNEES: ${{ github.repository_owner }}
           COMMIT_PREFIX: ${{ github.workflow }}${{':'}}
           PR_BODY: check out [`${{ env.SHORT_SHA }}`](https://github.com/${{ github.repository }}/commit/${{ github.sha }}) @${{ github.repository_owner }} :hatching_chick:.