Latest pip pip check fails for several packages

[danielhollas]

This is what I see running pip check on new builds:

async-generator 1.10 is not supported on this platform
certipy 0.1.3 is not supported on this platform
upf-to-json 0.9.2 is not supported on this platform

This is a consequence of pypa/pip#12884

Short term solution is probably to pin pip to previous version. EDIT: I've fixed the packages on conda-forge instead.

[danielhollas]

Opened issues on the corresponding feedstocks

conda-forge/async_generator-feedstock#2
conda-forge/upf_to_json-feedstock#4
conda-forge/certipy-feedstock#1

[danielhollas]

I've submitted PRs to fix the offending packages and they have now all been merged. 🎉
We do need to manually update them in the image though, I've done that in #489.

[unkcpz]

thanks @danielhollas
But where is async_generator and certipy used? We don't use these dependencies in AiiDAlab I assume?

[danielhollas]

They are dependencies of jupyterhub.