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As I do not see any pip release coming soon. I tried to find a temporary solution.
So I modified all the python docker images to not install the version 19.1 of pip (I installed tox and edited virtualenv.py and change the "pip" into "pip<19.1").
Now the tests are working again: https://drone.tryton.org/tryton/modules.account_invoice/178
(I stopped the cron task that update the docker image every month, until a new release of pip is available).

So now, I think we are back on track to release 5.2 the May 6th.