Refs #23919 -- Removed encoding preambles and future imports

tests/queries/models.py

@@ -1,8 +1,6 @@
 """
 Various complex queries that have been problematic in the past.
 """
-from __future__ import unicode_literals
-
 import threading
 
 from django.db import models

tests/queries/test_qs_combinators.py

@@ -1,5 +1,3 @@
-from __future__ import unicode_literals
-
 from django.db.models import F, IntegerField, Value
 from django.db.utils import DatabaseError
 from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature

tests/queries/tests.py

@@ -1,5 +1,3 @@
-from __future__ import unicode_literals
-
 import datetime
 import pickle
 import unittest