Support py3.13

[m4rc1e]

I'll probably have to update the packager which I'll do tomorrow. I think Blackrender also has an issue so I'll check that out as well.

Thanks @thundernixon

Will fix #1050

[m4rc1e]

I should drop py3.8 as well.

[m4rc1e]

This pr currently supports pip install gftools for py3.9-3.13. It doesn't work for py3.13 with the qa additions, pip install gftools[qa]. We need to wait for a new release of skia-python, kyamagu/skia-python#275 (comment)

[m4rc1e]

I'm going to merge this since it is in a better condition for py3.13 support than before. Once the new skia-python is released, it should fix itself for installing the qa additions/

[m4rc1e]

@arrowtype in a fresh py3.13 venv try pip install git+https://github.com/googlefonts/[email protected]. Support for QA additions in 3.13 are a fortnight or so away.

[arrowtype]

Success! That works perfectly for the person who was having issues with pyGit2. Installed in a venv, then used gftools --version and saw the specific version, plus (I think) a git commit hash.

Thanks!

[vv-monsalve]

Thanks, @m4rc1e!