Support python 3.14

[jtsiddons]

numba now supports 3.14 with release of 0.63.0: https://github.com/numba/numba/releases/tag/0.63.0

Add 3.14 to test suite, and add classifier in pyproject.toml

[github-actions]

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[ludwiglierhammer]

@jtsiddons: Thank you for this PR.
Could you please add something like this to CHANGES.rst:

Announcements
^^^^^^^^^^^^^
This release adds support for Python 3.14 (:pull:`339`) 

[github-actions]

Warning

This Pull Request modifies GitHub Workflows and is coming from a fork.
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[ludwiglierhammer]

@jtsiddons: Thanks. Feel free to add you to the contributors of the new version in CHANGES.

[github-actions]

Warning

This Pull Request modifies GitHub Workflows and is coming from a fork.
It is very important for the reviewer to ensure that the workflow changes are appropriate.