Add support for Python 3.14

[hagenw]

Add support and tests for Python 3.14.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Add Python 3.14 as a supported and tested runtime in CI and packaging metadata.

File-Level Changes

Change	Details	Files
Add Python 3.14 to the GitHub Actions test matrix so the test suite runs on that version.	Extend the CI matrix with a new job entry targeting ubuntu-24.04 and python-version 3.14. Configure the new matrix entry to execute the existing tests task, keeping parity with other Python versions.	.github/workflows/test.yml
Declare Python 3.14 support in project packaging classifiers.	Add the 'Programming Language :: Python :: 3.14' classifier alongside existing Python version classifiers. Keep the minimum required Python version unchanged while broadening the advertised compatibility range.	pyproject.toml

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