Refs #23919 -- Removed encoding preambles and future imports

tests/save_delete_hooks/models.py

@@ -4,8 +4,6 @@ Adding hooks before/after saving and deleting
 To execute arbitrary code around ``save()`` and ``delete()``, just subclass
 the methods.
 """
-from __future__ import unicode_literals
-
 from django.db import models
 from django.utils.encoding import python_2_unicode_compatible