Django 6.0 support improvements

[ulgens]

Description

Improve Django 6.0 support

Motivation and Context

Relates to:

• Add Python 3.14 and Django 6.0 to CI workflow matrix #1529

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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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[ddabble]

Nice 👍

[ulgens]

Pushed a slight improvement for the version classifier used in test.yml, replacing

pip install --pre "Django==6.0"

with

pip install "Django>=6.0,<6.1"