sphinxcontrib-asyncio: autopkg tests fail with setuptools v80:

[...]
  56s autopkgtest [00:59:17]: test command1:  - - - - - - - - - -
results - - - - - - - - - -
  56s command1             FAIL stderr:
/usr/lib/python3/dist-packages/sphinxcontrib/__init__.py:1: UserWarning:
pkg_resources is deprecated as an API. See
https://setuptools.pypa.io/en/latest/pkg_resources.html. The
pkg_resources package is slated for removal as early as 2025-11-30.
Refrain from using this package or pin to Setuptools<81.
  57s autopkgtest [00:59:18]: test command1:  - - - - - - - - - - stderr
- - - - - - - - - -
  57s /usr/lib/python3/dist-packages/sphinxcontrib/__init__.py:1:
UserWarning: pkg_resources is deprecated as an API. See
https://setuptools.pypa.io/en/latest/pkg_resources.html. The
pkg_resources package is slated for removal as early as 2025-11-30.
Refrain from using this package or pin to Setuptools<81.
  57s   __import__('pkg_resources').declare_namespace(__name__)
  57s /usr/lib/python3/dist-packages/sphinxcontrib/__init__.py:1:
UserWarning: pkg_resources is deprecated as an API. See
https://setuptools.pypa.io/en/latest/pkg_resources.html. The
pkg_resources package is slated for removal as early as 2025-11-30.
Refrain from using this package or pin to Setuptools<81.
  57s   __import__('pkg_resources').declare_namespace(__name__)
  57s autopkgtest [00:59:18]: @@@@@@@@@@@@@@@@@@@@ summary
  57s command1             FAIL stderr:
/usr/lib/python3/dist-packages/sphinxcontrib/__init__.py:1: UserWarning:
pkg_resources is deprecated as an API. See
https://setuptools.pypa.io/en/latest/pkg_resources.html. The
pkg_resources package is slated for removal as early as 2025-11-30.
Refrain from using this package or pin to Setuptools<81.

This package should be removed.

Fixing the 3 reverse-dependencies:

$ reverse-depends python3-sphinxcontrib-asyncio -b
Reverse-Build-Depends
=====================
* aioquic
* python-i3ipc

Reverse-Build-Depends-Indep
===========================
* python-tornado