v24.0 python module failed to build at Generating google/protobuf/unittest_arena_pb2.py

[cheese]

What version of protobuf and what language are you using?
Version: v24.0
Language: Python

What operating system (Linux, Windows, ...) and version?

Linux, Freedesktop SDK master

What runtime / compiler are you using (e.g., python version or gcc version)

Python 3.11.4
GCC 13.2.0

What did you do?
Steps to reproduce the behavior:

1. Build and install v24.0 protobuf
2. cd python
3. ./setup.py build
4. See error

What did you expect to see

Build without error.

What did you see instead?

/buildstream-build/python/./setup.py:40: DeprecationWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html
  import pkg_resources
/usr/lib/python3.11/site-packages/setuptools/dist.py:945: SetuptoolsDeprecationWarning: The namespace_packages parameter is deprecated.
!!

        ********************************************************************************
        Please replace its usage with implicit namespaces (PEP 420).

        See https://setuptools.pypa.io/en/latest/references/keywords.html#keyword-namespace-packages for details.
        ********************************************************************************

!!
  ep.load()(self, ep.name, value)
running build_py
Generating google/protobuf/unittest_arena_pb2.py...
google/protobuf/unittest_arena.proto: is an editions file, but code generator --python_out hasn't been updated to support editions yet. Please ask the owner of this code generator to add support or switch back to proto2/proto3.

Anything else we should know about your project / environment
The issue was introduced at c3b72b9

Downstream MR link: https://gitlab.com/freedesktop-sdk/freedesktop-sdk/-/merge_requests/14347