The "I may have found a bug in Python" release

What's Changed

• Fix CI caching and fix Python 3.9 bug by @TabulateJarl8 in #22

from __future__ import annotations is supposed to bring things like str | int typing back into Python 3.9 by quoting them as strings, like data: "str | int" = 0. However they seem to have forgotten about generic class instantiation typing where you can do MyClass[str | int]() to instantiate a class with generic types so it doesn't quote it and crashes the program. Maybe this is a bug in Python or maybe not, I'm not really sure

Full Changelog: v1.6.0...v1.6.1