Add basic 3.13 support, various cleanups and version bumps

[jakkdl]

• fixes Cannot import on 3.13, importlib.resources.read_text is removed #36
• drops support for 3.8
• now importable on 3.13
• parso does not support 3.13, so those tests are marked with xfail
• added 3.13-dev to CI
• expanded tox config so it's easier to specify what python version you want to test, while leaving all previous functionality intact
• specified base_python in the deps environment. The files were previously generated with 3.10, so left it at that, although it probably makes more sense to make that 3.9.
• updated deps/check.txt and deps/test.txt (feels like there should be a tox -e deps call in CI to check they're up-to-date?)
• bumped actions/checkout and actions/setup-python to latest versions
• I did not formally specify 3.13 support in setup.py, but looking up parso now I guess hyposmith viability does not strictly depend on it having 3.13 support.
• bumped mypy minimum version ... but it seems it's disabled in tox anyway?

[jakkdl]

@Zac-HD

Or I suppose maybe @aneeshusa and/or @thejcannon would be up for a first pass review as well.

I'm not 100% sure why test (3.8) is expected, if that's just a relic that will be cleaned up once this is properly merged, or something needs to be changed in the repo settings, or I forgot to change something somewhere.

[thejcannon]

LGTM

I'm not 100% sure why test (3.8) is expected

Where are you seeing that exactly?

[jakkdl]

although I can't see it in https://github.com/Zac-HD/hypothesmith/pull/37/checks so it's probably just github being weird?

[thejcannon]

@Zac-HD can confirm but I suspect that's because the branch protection rules likely still reference that job name?

[Zac-HD]

Yep, but also 3.8 EOL isn't until October, and I'd prefer not to drop it before then. if sys.version_info[:2] ... instead?

[Zac-HD]

Otherwise looks good - thanks @jakkdl!

[jakkdl]

Yep, but also 3.8 EOL isn't until October, and I'd prefer not to drop it before then. if sys.version_info[:2] ... instead?

oops, brain going a bit too fast. Will do

[Zac-HD]

Thanks @jakkdl!