[1.8.x] Sorted imports with isort; refs #23860.

Backport of 0ed7d15563 from master

tests/logging_tests/tests.py

@@ -4,22 +4,21 @@ from __future__ import unicode_literals
 import logging
 import warnings
 
+from admin_scripts.tests import AdminScriptTestCase
+
 from django.core import mail
 from django.core.files.temp import NamedTemporaryFile
-from django.test import TestCase, RequestFactory, override_settings
+from django.test import RequestFactory, TestCase, override_settings
 from django.test.utils import patch_logger
-from django.utils.encoding import force_text
 from django.utils.deprecation import RemovedInNextVersionWarning
+from django.utils.encoding import force_text
 from django.utils.log import (
     AdminEmailHandler, CallbackFilter, RequireDebugFalse, RequireDebugTrue,
 )
 from django.utils.six import StringIO
 
-from admin_scripts.tests import AdminScriptTestCase
-
 from .logconfig import MyEmailBackend
 
-
 # logging config prior to using filter with mail_admins
 OLD_LOGGING = {
     'version': 1,