Update tox matrix to include Django 5

Author: crucialfelix

tox.ini

@@ -7,7 +7,7 @@
 [tox]
 envlist =
   {py311}-flake8,
-  {py39,py310,py311,py312}-{dj32,dj40,dj41,dj42}
+  {py310,py311,py312}-{dj32,dj40,dj41,dj42,dj5}
 
 [gh-actions]
 python =
@@ -24,10 +24,11 @@ setenv =
 allowlist_externals = django-admin
 commands = django-admin test tests
 deps =
-  dj32: Django>=3.2,<3.3
+  dj32: Django>=3.2,<4
   dj40: Django>=4,<4.1
   dj41: Django>=4.1,<4.2
   dj42: Django>=4,<5
+  dj5: Django>=5.0,<6
   ; djmaster: https://github.com/django/django/zipball/master
 
 [testenv:py12-flake8]