python: Avoid relying on Collection supertype of QuerySet.

QuerySet doesn’t implement __contains__, so it can’t be a subtype of
Container or Collection (https://code.djangoproject.com/ticket/35154).
This incorrect subtyping annotation was removed in
https://github.com/typeddjango/django-stubs/pull/1925, so we need to
stop relying on it before upgrading to django-stubs 5.

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

zerver/lib/digest.py

@@ -7,7 +7,7 @@ from typing import Any, Collection, Dict, Iterator, List, Optional, Set, Tuple
 
 from django.conf import settings
 from django.db import transaction
-from django.db.models import Exists, OuterRef
+from django.db.models import Exists, OuterRef, QuerySet
 from django.utils.timezone import now as timezone_now
 from django.utils.translation import gettext as _
 from typing_extensions import TypeAlias
@@ -331,7 +331,7 @@ def get_slim_stream_id_map(realm: Realm) -> Dict[int, Stream]:
 
 
 def bulk_get_digest_context(
-    users: Collection[UserProfile], cutoff: float
+    users: Collection[UserProfile] | QuerySet[UserProfile], cutoff: float
 ) -> Iterator[Tuple[UserProfile, Dict[str, Any]]]:
     # We expect a non-empty list of users all from the same realm.
     assert users