[Bug 2087935] Re: DeprecationWarning for multi-threaded fork() under Python 3.12

[John Cooper]

Yes it's just stopping the error but the patch from upstream says that
they can't see how the process is using any multithreaded coded so this
silences the warning that is not relevant.

Longer term it might need to move from os.fork but patching inline with
upstream to fix this issue seems like the right solution here and the
move fro os.fork can be handed with a bug/patch upstream in Debian.

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https://bugs.launchpad.net/bugs/2087935

Title:
  DeprecationWarning for multi-threaded fork() under Python 3.12

Status in unattended-upgrades package in Ubuntu:
  Confirmed
Status in unattended-upgrades package in Debian:
  New

Bug description:
  We run unattended-upgrades on a lot of servers, but on Ubuntu noble (Ubuntu 24.04.1 LTS) we're getting a lot of cron spam that doesn't appear elsewhere:
  > /usr/bin/unattended-upgrade:567: DeprecationWarning: This process (pid=475626) is multi-threaded, use of fork() may lead to deadlocks in the child.
  > pid = os.fork()

  The above message appears several times during an upgrade; the count
  is different each week, presumably relating to what operations are
  needed.

  lsb_release -rd:
  No LSB modules are available.
  Description:	Ubuntu 24.04.1 LTS
  Release:	24.04

  Relevant packages:
  unattended-upgrades  2.9.1+nmu4ubuntu1
  python3.12           3.12.3-1ubuntu0.2

  The warning appears to be introduced in Python 3.12 - https://docs.python.org/3/whatsnew/3.12.html
  > On POSIX platforms, os.fork() can now raise a DeprecationWarning when it can detect being called from a multithreaded process

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