bug#67572: tests fail for python-sphinx-prompt

[Lars-Dominik Braun]

Hi,

> All 12 of the tests for python-sphinx-prompt fail:
> 
>   https://ci.guix.gnu.org/build/2678884/log/raw

fixed by commit 877086a8649a86f1556bddd430e9478b2562f365.

Cheers,
Lars