Add support for Django 4.1

Author: Sébastien Fievet

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
     py{36,37,38,39,310}-django32,
-    py{38,39,310}-django40,
+    py{38,39,310}-django{40,41},
     coverage
 
 [gh-actions]
@@ -24,6 +24,7 @@ deps =
     pytest-django
     django32: Django>=3.2,<3.3
     django40: Django>=4.0,<4.1
+    django41: Django>=4.1,<4.2
 
 [testenv:coverage]
 basepython = python3.8