Log Message:
py-setuptools: update to 71.0.4.

v71.0.4
=======

Bugfixes
--------

- Removed lingering unused code around Distribution._patched_dist. (#4489)

v71.0.3
=======

Bugfixes
--------

- Reset the backports module when enabling vendored packages. (#4476)

v71.0.2
=======

Bugfixes
--------

- Include all vendored files in the sdist. (#4480)

v71.0.1
=======

Bugfixes
--------

- Restored package data that went missing in 71.0. This change also incidentally \ 
causes tests to be installed once again. (#4475)

v71.0.0
=======

Deprecations and Removals
-------------------------

- Now setuptools declares its own dependencies in the ``core`` extra. \ 
Dependencies are still vendored for bootstrapping purposes, but setuptools will \ 
prefer installed dependencies if present. The ``core`` extra is used for \ 
informational purposes and should *not* be declared in package metadata (e.g. \ 
``build-requires``). Downstream packagers can de-vendor by simply removing the \ 
``setuptools/_vendor`` directory. Since Setuptools now prefers installed \ 
dependencies, those installing to an environment with old, incompatible \ 
dependencies will not work. In that case, either uninstall the incompatible \ 
dependencies or upgrade them to satisfy those declared in ``core``. (#2825)