python: Import F, Q, QuerySet from their canonical module.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

analytics/views/realm_activity.py

@@ -3,7 +3,7 @@ from datetime import datetime
 from typing import Any, Dict, List, Optional, Set, Tuple
 
 from django.db import connection
-from django.db.models.query import QuerySet
+from django.db.models import QuerySet
 from django.http import HttpRequest, HttpResponse, HttpResponseNotFound
 from django.shortcuts import render
 from django.utils.timezone import now as timezone_now