feat: django 5.2 support

[dopry]

Description of the Change

• add django 5.2 to tox
• add python 3.14 for django 5.2

Checklist

• PR only contains one change (considered splitting up PR)
• [n/a] unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS
• tests/app/idp updated to demonstrate new features
• [n/a] tests/app/rp updated to demonstrate new features

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull Request Overview

This PR adds support for Django 5.2 and Python 3.14 to the django-oauth-toolkit project. The changes update configuration files, testing infrastructure, and documentation to include the new versions.

• Added Django 5.2 and Python 3.14 to tox testing configurations
• Updated GitHub Actions workflow to test against the new versions
• Updated project metadata and documentation to reflect version support

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tox.ini	Added Python 3.14 and Django 5.2 test environments, including py314 in gh-actions mapping
tests/app/idp/requirements.txt	Updated Django version constraint to include 5.2
pyproject.toml	Added Python 3.14 upper bound, Django 5.2 framework classifier, and Python 3.13/3.14 version classifiers
docs/index.rst	Updated documentation to list explicit Python versions (3.8-3.14) and Django versions (4.2-5.2)
README.rst	Updated requirements section to list explicit Python versions (3.8-3.14) and Django versions (4.2-5.2)
CHANGELOG.md	Added release notes for Django 5.2 and Python 3.14 support with Django version requirement
.github/workflows/test.yml	Added Python 3.13/3.14 and Django 5.2 to test matrix with appropriate exclusions

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