Bump python versions to test against

tox.ini

@@ -1,15 +1,13 @@
 [tox]
-envlist    = py{36,37,38}-dj{22,30,31,32},py{38}-dj{main}
+envlist    = py{38,310,312}-dj{32,42},py{312}-dj{main}
 
 [testenv]
-basepython = py36: python3.6
-             py37: python3.7
-             py38: python3.8
+basepython = py38: python3.8
+             py310: python3.10
+             py312: python3.12
 commands   = python -W module manage.py test testproject
-deps       = dj22: Django~=2.2.0
-             dj30: Django~=3.0.0
-             dj31: Django~=3.1.0
-             dj32: Django~=3.2.0
+deps       = dj32: Django~=3.2.0
+             dj42: Django~=4.2.0
              djmain: https://github.com/django/django/archive/refs/heads/main.zip
 
 [testenv:flake8]