deps: update numpy and statsmodels to solve python3.12 incompatibilities

Maybe there are wiser ways of only requiring updated packages for python 3.12,
while still allowing older package versions for python <= 3.11, but I was only
looking for the minimum set of working packages.

The issue with numpy is documented here, and officially solved with numpy 1.26:
https://numpy.org/devdocs/reference/distutils_status_migration.html

This commit needs to be reworked, and either squashed in the one updating the
python compatibility, or better moved BEFORE dropping python 3.8 and introducing
3.12.