ROS 2 Rolling: Warning on all Python packages

[clalancette]

I'm currently using this extension (on the devel branch) to build my ROS 2 Rolling workspace. Since the latest update, I've gotten a new warning when building any ament_python package:

Invalid -W option ignored: invalid module name: 'setuptools.warnings'

Presumably that comes from d48d683 . I'm currently using setuptools version 59.6.0 (the packaged version in Ubuntu 22.04). Let me know if you need more information.