Refs #23919 -- Removed python_2_unicode_compatible decorator usage

tests/custom_pk/fields.py

@@ -3,10 +3,8 @@ import string
 
 from django.db import models
 from django.utils import six
-from django.utils.encoding import python_2_unicode_compatible
 
 
-@python_2_unicode_compatible
 class MyWrapper(object):
     def __init__(self, value):
         self.value = value