Update to use assertQuerySetEqual for Django 4.2+

Add TestCase with fallback.

Author: carltongibson

django_filters/compat.py

@@ -1,4 +1,11 @@
+import django
 from django.conf import settings
+from django.test import TestCase
+
+if django.VERSION < (4, 2):
+    class TestCase(TestCase):
+        assertQuerySetEqual = TestCase.assertQuerysetEqual
+
 
 # django-crispy-forms is optional
 try: