trivial: update FieldDoesNotExist import location for django 3.2 (#64300)

hobo/rest_authentication.py

@@ -3,7 +3,7 @@ import logging
 from django.conf import settings
 from django.contrib.auth import get_user_model
 from django.contrib.auth.models import AnonymousUser
-from django.db.models.fields import FieldDoesNotExist
+from django.core.exceptions import FieldDoesNotExist
 from django.utils.module_loading import import_string
 from rest_framework import authentication, exceptions, status