Circup

Updated the version pinned for `importlib_metadata` from 0.20 to 4.12.0, due to incompatibility with the most recent version of `setuptools`.

What's Changed
* add platform entry for 8mpy by FoamyGuy in https://github.com/adafruit/circup/pull/145


**Full Changelog**: https://github.com/adafruit/circup/compare/1.0.4...1.1.0

* special-case circuitpython_typing by dhalbert in https://github.com/adafruit/circup/pull/142

Prevents spurious message:

WARNING:
adafruit_typing is not a known CircuitPython library.

This release notifies the user when a new release is available. Thank you dhalbert

The CircuitPython bundle dropped support for CircuitPython 6.x, which also required removing references to it from circup. Thanks foamyguy.

A dependency used while building the documentation was bumped to a newer version. Thanks dependabot.