modified the event trigger from 'pull_request' to 'pull_request_targe…

…t' to invoke the workflow of 'after-validate-submission.yaml' in the context of the base repo (need to be careful on merging)

.github/workflows/after-validate-submission.yaml

@@ -5,7 +5,7 @@ on:
   #  workflows: ["Hub Submission Validation (R)"]  # The name of the workflow we want to trigger from
   #  types:
   #    - completed
-  pull_request:
+  pull_request_target:
     types:
       - closed