Fix YAML labels

Author: lucperkins

.github/workflows/update-flake-lock.yml

@@ -59,7 +59,8 @@ jobs:
           committer: github-actions[bot] github-actions[bot]@users.noreply.github.com
           assignees: lucperkins
           reviewers: lucperkins
-          labels: automated
+          labels: |
+            automated
             templates
             update
           body: |