Refs #33928 -- Removed unnecessary attribute assignment on on-delete updates.

Model instances retrieved for bulk field update purposes are not exposed
to the outside world and thus are not required to be kept update to
date.

django/db/models/deletion.py

@@ -497,11 +497,6 @@ class Collector:
                             origin=self.origin,
                         )
 
-        # update collected instances
-        for instances_for_fieldvalues in self.field_updates.values():
-            for (field, value), instances in instances_for_fieldvalues.items():
-                for obj in instances:
-                    setattr(obj, field.attname, value)
         for model, instances in self.data.items():
             for instance in instances:
                 setattr(instance, model._meta.pk.attname, None)