Add Django 5.0 and Python 3.12 to tox test matrix

tox.ini

@@ -2,8 +2,9 @@
 envlist =
     py{37,38,39,310}-dj32
     py{38,39,310}-dj40
-    py{38,39,310,py311}-dj41
-    py{38,39,310,py311}-dj42
+    py{38,39,310,311}-dj41
+    py{38,39,310,311}-dj42
+    py{310,311,312}-dj42
     py{311}-djmain
     py{311}-djqa
 
@@ -14,13 +15,15 @@ python =
     3.9: py39
     3.10: py310
     3.11: py311
+    3.12: py312
 
 [gh-actions:env]
 DJANGO =
     3.2: dj32
     4.0: dj40
     4.1: dj41
     4.2: dj42
+    5.0: dj50
     main: djmain
     qa: djqa
 
@@ -30,6 +33,7 @@ deps =
     dj40: django>=4.0,<4.1
     dj41: django>=4.1,<4.2
     dj42: django>=4.2,<4.3
+    dj50: django>=5.0,<5.1
     djmain: https://github.com/django/django/archive/main.tar.gz
     coverage
     requests-mock