Bump supported Python & Django versions. (#55)

.github/workflows/main.yml

@@ -45,7 +45,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v2

tox.ini

@@ -5,7 +5,9 @@
 
 [tox]
 envlist =
-    py{38,39,310}-django{32,41,42,main},
+    py{38,39,310,311,312}-django42,
+    # Django 5.0 drops support for Python 3.8 and 3.9.
+    py{310,311,312}-django{50,51,main},
     # Django 4.1.3 adds support for Python 3.11.
     py311-django{41,42,main}
 isolated_build = True
@@ -16,9 +18,7 @@ commands =
     python manage.py test
 deps =
     Jinja2
-    django22: Django>=2.2,<2.3
-    django31: Django>=3.1,<3.2
-    django32: Django>=3.2,<3.3
-    django41: Django>=4.1,<4.2
     django42: Django>=4.2,<4.3
+    django50: Django>=5.0,<5.1
+    django51: Django>=5.1b1,<5.2
     djangomain: https://codeload.github.com/django/django/zip/main