Revert license and license-files changes in pyproject.toml

[ntBre]

Summary

This partially reverts commit 13634ff after issues in the release today.

Test Plan

uv build --sdist
tar -tzf dist/ruff-0.12.6.tar.gz | grep ruff-0.12.6/LICENSE

which finds the license now.

[DimitriPapadopoulos]

I have read #19599 and this PR, and don't understand the texst plan. Is the issue that uv build does not support PEP 639 yet and pushes license-less packages to PiPY?

[ntBre]

I saw you got an answer on #19599, but you're right. I forgot all of the conversation around this was on Discord and could have included more context here. It might be helpful in the future.

During the 0.12.6 release, the sdist upload was rejected from PyPI for not containing the LICENSE file. I was able to verify that locally with the commands in the test plan. After the changes in this PR, the same commands confirmed that the LICENSE was back in the sdist before we tried another release.

As mentioned on #19599, the root cause seems to be a maturin bug, so we should be able to revert this revert at some point in the future.

[DimitriPapadopoulos]

Thank you so much. I have created draft PR #19661 that attempts to explain all known issues.

[DimitriPapadopoulos]

Putting aside the main issue (the maturin bug):

It turns out pip-licences is not much maintained and has been forked into pip-licenses-cli which does support PEP 639. Also pip show has been updated and does support PEP 639 according to What's new in pip 25.0.