Bug#1017402: scikit-learn: autopkgtest times out on powerful hosts

[Graham Inggs]

Hi Paul

I did some investigation on a 64-core amd64 machine and found I could
reduce the number of cores used during the autopkgtests by setting
JOBLIB_MULTIPROCESSING, without having a big impact on the running
time (only some of the tests seem to use all available cores).

I've uploaded scikit-learn/1.1.2+dfsg-4 with this change.  Would you
please remove the blocked architectures from ci.d.n and check if the
tests still time out?

I still expect the bus error on armhf from #1003165 which is not yet resolved.

Regards
Graham