Add Python 3.14 and Django 6.0 to CI workflow matrix

[cclauss]

Python v3.14 -- October 7th

• https://www.python.org/download/pre-releases
• https://www.python.org/downloads/release/python-3140rc3
• https://docs.python.org/3.14/whatsnew/3.14.html
• https://code.djangoproject.com/ticket/35844

Django 5.2 will be the first version to support Python 3.14

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have run the pre-commit run command to format and lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[tim-schilling]

@cclauss thank you for the PR! Would you like to add your name to AUTHORS.rst?

[cclauss]

Test / Check generated files (pull_request) fails. -- Perhaps somewhere in the new changes, we need Django>=6.0a1.

• https://pypi.org/project/Django/#history

[tim-schilling]

Thanks for the PR @cclauss!