Add Django 6.0 support

[cavanierc]

Description

Add support for Django 6.0

Changes

• ✅ Updated setup.py classifiers
• ✅ Added Django 6.0 to tox test
• ✅ All tests passing with Django 6.0

Testing

• Tested with Django 6.0.0
• All existing tests pass
• No breaking changes

Checklist

• Tests pass locally
• Documentation updated

[Copilot]

Pull request overview

This pull request attempts to add support for Django 6.0 and Python 3.14 to the django-celery-beat project. However, both Django 6.0 and Python 3.14 do not exist yet as of December 2025. Django 5.1.x is the current stable release with Django 5.2 in development, and Python 3.13 is the latest released Python version. The PR cannot be merged in its current state as it references non-existent versions that will cause installation and testing failures.

Key Changes (All Problematic):

• Added Django 6.0 classifiers and test configurations (version doesn't exist)
• Added Python 3.14 classifier and test configurations (version doesn't exist)
• Updated dependency upper bounds to include Django 6.0 (premature)

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tox.ini	Adds Django 6.0 (django60) and Python 3.14 (py314) to test matrix - both versions don't exist
setup.py	Adds classifiers for Django 6.0 and Python 3.14 - both versions don't exist
requirements/test-django.txt	Updates upper bound to <6.1 to allow Django 6.0 - version doesn't exist
requirements/docs.txt	Updates upper bound to <6.1 to allow Django 6.0 - version doesn't exist

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.18%. Comparing base (7b4cf16) to head (e36abe9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #978   +/-   ##
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  Coverage   88.18%   88.18%           
=======================================
  Files          32       32           
  Lines        1007     1007           
  Branches      105      105           
=======================================
  Hits          888      888           
  Misses        101      101           
  Partials       18       18           

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