update batch

http-api/app/routes/enrollments/cancel.py

@@ -46,7 +46,10 @@ def cancel(id: str, payload: Cancel):
     set_status_as_canceled(
         id,
         lock_hash=payload.lock_hash,
-        author=user.model_dump(),  # type: ignore
+        author={
+            'id': user.id,
+            'name': user.name,
+        },
         course=payload.course,  # type: ignore
         vacancy_key=KeyPair.parse_obj(payload.vacancy),
         persistence_layer=enrollment_layer,