GitHub Actions: Add Python 3.13 to the testing

[cclauss]

Python 3.13 was blocked waiting on
numba>=0.61.0 -- https://pypi.org/project/numba/#history and
triton>3.1.0 -- https://pypi.org/project/triton/#history
but now the PyPI releases of both are compatible with Python 3.13.

• Python 3.13 builds triton-lang/triton#5215

[rdinkel]

Hey,
what is the current state here?
triton 3.2.0 is available.
I am asking because the flatpak of kdenlive ships with python 3.13 and installing whisper inside fails building wheel.

[cclauss]

@jongwook Tests on Python 3.13 now pass with the new versions of numba and triton.

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[rdinkel]

looks ok