Update notify-parent.yaml

Author: ryanpolasky

.github/workflows/notify-parent.yaml

@@ -8,10 +8,10 @@ jobs:
   notify:
     runs-on: ubuntu-latest
     steps:
-      - name: Dispatch update event
+      - name: Dispatch subtree update event
         run: |
           curl -X POST \
             -H "Authorization: Bearer ${{ secrets.PARENT_REPO_TOKEN }}" \
             -H "Accept: application/vnd.github+json" \
             https://api.github.com/repos/acmutd/meteormate-client/dispatches \
-            -d '{"event_type":"submodule-updated"}'
+            -d '{"event_type":"subtree-updated"}'