feat: add support for python 3.13

[afuetterer]

What does this PR do?

This PR adds support for Python 3.13.

Before submitting

• This PR fixes a typo or improves the docs (if yes, ignore all other checks!).
• Did you read the contributor guideline?
• Was this discussed/approved via a Github issue? Please add a link to it if that's the case.
• Did you make sure to update the documentation with your changes (if applicable)?
• Did you write any new necessary tests?

[afuetterer]

This is still blocked by dependencies not being ready for 3.13.

[afuetterer]

Finally.

Now you have 167 warnings when testing Python 3.13. You have DeprecationWarnings and FutureWarnings.

See: https://github.com/MaartenGr/BERTopic/actions/runs/12965576901/job/36165467740?pr=2173#step:5:44

[MaartenGr]

@afuetterer Thanks for checking this! I'll make sure to merge this. It's going to be quite a bit of work to remove all of those warnings (mostly the deprecation warnings) but for now I'm happy that we can support 3.13, thanks!

[afuetterer]

I think quite a few of those warnings are actually the same, so fixable by changing one line in BERTopic, e.g.

tests/test_bertopic.py: 18 warnings /home/runner/work/BERTopic/BERTopic/bertopic/_bertopic.py:3467: DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments.

18 warnings from the same line. It should be possible to address those.