Update github3 to 3.2 release

[Mark-Simulacrum]

Tests pass, but that coverage is pretty minimal I think -- not sure, but I think our best bet is to just merge and monitor after doing so to make sure it works OK.

[reneleonhardt]

@pietroalbini Can outdated dependencies be updated again? And PRs be reviewed and merged? 😅 If you want to save your contributors time you could try CodeRabbit. https://github.com/coderabbitai/awesome-coderabbit