Linux builds are failing with new docker-py 3.6.0

@samuel.gaist: could you have a look at this today?

Job #153447 failed for 2580eac2:

N.B.: there is an issue with the current "Schedules" feature of gitlab (https://secure.idiap.ch/bugzilla5/show_bug.cgi?id=15791)

TBC: I just re-ran the nightlies manually to see if the builds would get stuck in the same position: https://gitlab.idiap.ch/beat/beat.nightlies/pipelines/25464