Describe the bug

When running the sktime binder, the environment setup breaks over scikit-posthocs unable to load pyqt5 in setup.py.
This is reproducible using multiple browsers and computers (all running Windows).

Have not investigated what causes the issue, but it´s possibly an incomplete requirements file somewhere in the dependency graph.

See printout here.

To Reproduce

1. Go to sktime binder
2. watch the "starting prompt"

Expected behavior

no error occurs, binder loads as expected