Bump to Python 3.14, Django 6.1 and ruff 0.17

Django 6.1 requires MySQL 8.4 or MariaDB 10.11 or newer.

.gitea/workflows/tests.yml

@@ -18,7 +18,7 @@ jobs:
 
   tests:
     runs-on: ubuntu-latest
-    container: nikolaik/python-nodejs:python3.11-nodejs20
+    container: nikolaik/python-nodejs:python3.14-nodejs20
     steps:
       - uses: actions/checkout@v4