CI Failures due to new scipy and new numpydoc

[Dr-Irv]

The job Downstream Compat is failing in CI because statsmodels 0.14.4 is incompatible with scipy 1.16.0. The latter was released on June 22, so that's why we have recent failures.

Should we lock down the scipy version to 1.15.3 in ci/deps/actions-311-downstream_compat.yaml ?

The job Docstring validation, typing, and other manual pre-commit hooks is failing because numpydoc 1.9 was released on June 24. Should we pin numpydoc to 1.8?

[Dr-Irv]

Regarding statsmodels and scipy - statsmodels/statsmodels#9584

[jorisvandenbossche]

Opened #61750 as a temporary fix for the statsmodels/scipy issue