Regression - Module "_typeshed" has no attribute "SupportsLessThan"

[Zeckie]

Bug Report

The example of using SupportsLessThan in the documentation does not work in mypy 0.941 or 0.940.

To Reproduce

https://mypy-play.net/?mypy=0.931&python=3.10&gist=6ad43abe09b33cd9dceea02d40c0224d

Works correctly on 0.931, but not 0.941 or 0.940.

[AlexWaygood]

We got rid of SupportsLessThan from _typeshed in python/typeshed#6583, because it wasn't doing a great job at describing the various types at runtime it was trying to describe. We replaced it with a new SupportsRichComparison type, which is a little more complicated, but does a much better job at describing the types at runtime.