This is failing on documentation build with:
/usr/bin/python3: No module named sphinx
which should be (in Debian) coming from python3-sphinx -- specifically
this file:
/usr/lib/python3/dist-packages/sphinx/__init__.py
However the build log at
https://people.debian.org/~sanvila/build-logs/202509/python-parsl_2025.01.13+ds-1_amd64-20250930T113006.403Z
only shows python3-sphinx as a recommended dependency, not one that is
installed for the build.
I don't have my head in the Debian/Python packaging enough to see off the
top of my head what changed here.
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