Add Python 3.14 and Django 52 to tox configuration

Author: cclauss

tox.ini

@@ -3,6 +3,7 @@ envlist =
     py3{9-13}-dj42-{sqlite3,postgres,mysql,mariadb},
     py3{10-13}-dj{50-52}-{sqlite3,postgres,mysql,mariadb},
     py3{12-13}-dj{main}-{sqlite3,postgres,mysql,mariadb},
+    py314-dj{52,main}-{sqlite3,postgres,mysql,mariadb},
     docs,
     lint
 
@@ -13,6 +14,7 @@ python =
     3.11: py311, docs, lint
     3.12: py312
     3.13: py313
+    3.14: py314
 
 [gh-actions:env]
 DJANGO =