Test: enable Django 5.0alpha and Python 3.12rc

Author: medmunds

CHANGELOG.rst

@@ -36,6 +36,7 @@ Other
 * **Mailgun (docs):** Clarify account-level "Mailgun API keys" vs.
   domain-level "sending API keys." (Thanks to `@sdarwin`_ for
   reporting the issue.)
+* Test against prerelease versions of Django 5.0 and Python 3.12.
 
 
 v10.1

tox.ini

@@ -22,10 +22,10 @@ envlist =
     # Django 3.0: Python 3.6 (eol 2021-12-23), 3.7, 3.8, 3.9 (added in 3.0.11)
     django30-py{38,39,py38,py39}-all
     # ... then prereleases (if available) and current development:
-    # Django 5.0 alpha: Python 3.10+
-    #   [not yet in alpha] django50-py{310,311,py310,py311}-all
-    # Django 5.0 dev: Python 3.10+
-    djangoDev-py{310,311}-all
+    # Django 5.0 alpha: Python 3.10, 3.11, 3.12
+    django50-py{310,311,312}-all
+    # Django 5.1 dev: Python 3.10+
+    djangoDev-py{310,311,312}-all
     # ... then partial installation (limit extras):
     django42-py311-{none,amazon_ses,postal}
 # tox requires isolated builds to use pyproject.toml build config: