Refs #23919 -- Removed a stray object-inheritance.

Follow up to 081e7871.

tests/logging_tests/tests.py

@@ -109,7 +109,7 @@ class DefaultLoggingTests(SetupDefaultLoggingMixin, LoggingCaptureMixin, SimpleT
         self.assertEqual(self.logger_output.getvalue(), '')
 
 
-class LoggingAssertionMixin(object):
+class LoggingAssertionMixin:
 
     def assertLogsRequest(self, url, level, msg, status_code, logger='django.request', exc_class=None):
         with self.assertLogs(logger, level) as cm: