Update timezone import

This should since django 5 be done from python datetime library instead
of the django library

binder/models.py

@@ -19,7 +19,7 @@
 from django.db.models import signals
 from django.core.exceptions import ValidationError
 from django.db.models.query_utils import Q
-from django.utils import timezone
+from datetime import timezone
 from django.utils.translation import gettext_lazy as _
 from django.utils.dateparse import parse_date, parse_datetime