fix(workflow): add newline at EOF in sync-labels.yml

Ensure consistent file formatting by adding a newline at the end
of the sync-labels.yml file. This change improves compatibility
with various tools and follows best practices for file formatting.

.github/workflows/sync-labels.yml

@@ -33,4 +33,4 @@ jobs:
             # Update the labels using the create-or-update-label action
             gh label create "$name" --color "$color" --description "$description" || gh label edit "$name" --color "$color" --description "$description"
           
-          done
+          done