Per django/django#15205 make minimum version of dj40 be 4.0.1.

Author: n2ygk

tox.ini

@@ -36,7 +36,7 @@ setenv =
 deps =
     dj22: Django>=2.2,<3
     dj32: Django>=3.2,<3.3
-    dj40: Django>=4.0,<4.1
+    dj40: Django>=4.0.1,<4.1
     djmain: https://github.com/django/django/archive/main.tar.gz
     djangorestframework
     oauthlib>=3.1.0