fix: changing activity_or_flow_id to str to fix the query

src/apps/answers/filters.py

@@ -34,7 +34,7 @@ class AppletSubmissionsFilter(BaseQueryParams):
 class AppletSubmitDateFilter(BaseQueryParams):
     respondent_id: uuid.UUID | None
     target_subject_id: uuid.UUID | None
-    activity_or_flow_id: uuid.UUID | None
+    activity_or_flow_id: str | None
     from_date: datetime.date
     to_date: datetime.date