Cygwin pip now has a chance to resolve everything on the command line.  

It won't be able to resolve dependencies, due to something pulling in Rust, but it'll get to the point where pip points out that it is not pip's fault that CI doesn't have Rust compilers for Cygwin

jaraco.text depends on inflect; inflect>=6.0.0 depends on Rust.
Add an additional rule installing a version of the dependency that will actually install.