python3 package on 20.04 is missing important sysconfig patch from debian

[Adrian Insaurralde Avalos]

please update the python 3 package and add https://salsa.debian.org/cpython-team/python3/-/blob/python3.8/debian/patches/sysconfig-debian-schemes.diff

without it sysconfig gives incorrect paths for python paths, forcing people to use distutils instead, however distutils has been deprecated in 3.10 and removed from python 3.12 making it difficult to support both python 3.12 and ubuntu 20.04 at the same time.

> lsb_release -rd
Description: Ubuntu 20.04.6 LTS
Release: 20.04

> apt-cache policy python3
python3:
  Installed: 3.8.2-0ubuntu2
  Candidate: 3.8.2-0ubuntu2
  Version table:
 *** 3.8.2-0ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

expected:
> /usr/bin/python3 -c "from sysconfig import get_path; print(get_path('purelib'))"
/usr/local/lib/python3.8/dist-packages
> DEB_PYTHON_INSTALL_LAYOUT=deb_system /usr/bin/python3 -c "from sysconfig import get_path; print(get_path('purelib'))"
/usr/lib/python3/dist-packages

what happened instead:
> /usr/bin/python3 -c "from sysconfig import get_path; print(get_path('purelib'))"
/usr/lib/python3.8/site-packages
> DEB_PYTHON_INSTALL_LAYOUT=deb_system /usr/bin/python3 -c "from sysconfig import get_path; print(get_path('purelib'))"
/usr/lib/python3.8/site-packages

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.