[python-team] Weird python-notebook test failures

[Ricardo Wurmus]

Hi Guix,

on the python-team branch I'm slowly fixing build errors, but I can't
figure out what's wrong with python-notebook:

    https://ci.guix.gnu.org/build/3872654/details

Nothing big changed that would explain the build failure.  It looks like
the notebook server doesn't start and all the errors we get are due to
"Connection refused".

Any ideas what might be going on here?

-- 
Ricardo