help with python3 depends < 3.11

[Stephen Sinclair <radarsat1@gmail.com>]

Dear mentors,

I have been trying to make an update to my package "siconos".
However, in the Salsa build, which nicely runs all tests, it fails on
"piuparts".

The job log is here:
https://salsa.debian.org/science-team/siconos/-/jobs/3796471

I am confused, because it fails with the following error:

> The following packages have unmet dependencies:
> python3-siconos : Depends: python3 (< 3.11) but 3.11.1-1 is to be installed

However, debian/control uses ${python3:Depends} and does not mention
version 3.11 anywhere, so I cannot understand where it's getting this
"< 3.11" constraint from.

Any help would be appreciated, thank you.

Steve