Should we drop support for Cygwin?

[cclauss]

Windows Subsystem for Linux has taken lots of mindshare from Cygwin, slowing its development to the point where its default Python is now v3.9, which is end-of-life. Given that our README.md suggests a supported version of Python, we will soon stop supporting and testing Python 3.9.

Will Cygwin upgrade to a supported version of Python? If not, what would be the impact of us dropping support for Cygwin?

• Mentions of Cygwin in code, issues, pull requests: https://github.com/search?q=repo%3Anodejs%2Fnode-gyp+cygwin

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Perhaps this solves things?
https://cygwin.com/packages/summary/python312.html vs.
https://cygwin.com/packages/summary/python3.html (v3.9).

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Node-gyp usage on Cygwin is blocked by:

• Lxml is only supported on end-of-life versions of Python cygwin/cygwin-install-action#55