Fix PyPI PIP 625 incompatibility

[taughz]

Uploading tarballs with - instead of _ results in the following email sent to the uploader:

In the future, PyPI will require all newly uploaded source
distribution filenames to comply with PEP 625. Any source
distributions already uploaded will remain in place as-is and do not
need to be updated.

Specifically, your recent upload of 'package-name-0.0.1.tar.gz' is
incompatible with PEP 625 because it does not contain the normalized
project name 'package_name'.

In most cases, this can be resolved by upgrading the version of your
build tooling to a later version that supports PEP 625 and produces
compliant filenames.

[taughz]

I did not attempt to change stdeb related functionality. So those are still using setup.py. I'm mostly trying to make PyPI happy.

There is an assumption here that build has been installed. I was not sure how best to express that dependency. The CI workflow might need to be updated, for example here: https://github.com/colcon/ci/blob/17cac168e05b5c0d109a5e482eaeb60708b3307e/action.yaml#L17