Update to ZWO SDK 1.20.0

[EricClaeys]

Upgrade ZWO libraries to 1.20.
I can't find any way to do a Pull Request against a binary file - perhaps because I don't own the repository.
ZWO's change log:

V1.20 2021.9.6
Add new cameras ASI482MC,ASI485MC
Fix some bugs

lib.zip

[ckuethe]

You just have to commit them to your fork of the repo. https://docs.github.com/en/get-started/quickstart/fork-a-repo