libcst upgrade (1.6.0 → 1.8.6)

[SamuelMarks]

🐍 Package Request

• Package Name and Version: libcst / 1.8.6
• Package URL: https://pypi.org/project/libcst/
• Package Dependencies that needs to be resolved first:

Checklists

• I have tried to install the package using micropip.install(...) and encountered the issue.
• I have read the documentation and tried building the package myself.

[ryanking13]

PR welcome