build: Updating workflow `add-remove-label-on-comment.yml`.

The .github/workflows/add-remove-label-on-comment.yml workflow is missing or needs an update to stay in
sync with the current standard for this workflow as defined in the
`.github` repo of the `openedx` GitHub org.

Author: feanil

.github/workflows/add-remove-label-on-comment.yml

@@ -17,3 +17,4 @@ on:
 jobs:
   add_remove_labels:
     uses: openedx/.github/.github/workflows/add-remove-label-on-comment.yml@master
+