python3: reduce needs proper six import (#32449)

src/authentic2/custom_user/managers.py

@@ -15,6 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from django.db import models
+from django.utils import six
 from django.utils import timezone
 from django.contrib.auth.models import BaseUserManager
 
@@ -44,7 +45,7 @@ class UserQuerySet(models.QuerySet):
                 q = q | models.query.Q(
                     attribute_values__content__icontains=term, attribute_values__attribute=a)
             queries.append(q)
-        self = self.filter(reduce(models.query.Q.__and__, queries))
+        self = self.filter(six.moves.reduce(models.query.Q.__and__, queries))
         # search by attributes can match multiple times
         if searchable_attributes:
             self = self.distinct()