fix(packaging): use SPDX license config, other small maintenance

[jameslamb]

Bundling together a couple of small maintenance updates.

Switch to SPDX license identifiers

The most important update, because without it CI will start breaking here in a few months.

Resolves warnings about license metadata by switching to an SPDX identifier and moving the floor on setuptools to >=77.0.0.

logs with relevant warnings (click me)

* Building wheel...
/tmp/build-env-bxde7cxp/lib/python3.9/site-packages/setuptools/config/_apply_pyprojecttoml.py:82: SetuptoolsDeprecationWarning: `project.license` as a TOML table is deprecated
!!

        ********************************************************************************
        Please use a simple string containing a SPDX expression for `project.license`. You can also use `project.license-files`. (Both options available on setuptools>=77.0.0).

        By 2026-Feb-18, you need to update your project and remove deprecated calls
        or your builds will no longer be supported.

        See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
        ********************************************************************************

!!
  corresp(dist, value, root_dir)
/tmp/build-env-bxde7cxp/lib/python3.9/site-packages/setuptools/config/_apply_pyprojecttoml.py:61: SetuptoolsDeprecationWarning: License classifiers are deprecated.
!!

        ********************************************************************************
        Please consider removing the following classifiers in favor of a SPDX license expression:

        License :: OSI Approved :: Apache Software License

        See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
        ********************************************************************************

!!
  dist._finalize_license_expression()
/tmp/build-env-bxde7cxp/lib/python3.9/site-packages/setuptools/dist.py:759: SetuptoolsDeprecationWarning: License classifiers are deprecated.
!!

        ********************************************************************************
        Please consider removing the following classifiers in favor of a SPDX license expression:

        License :: OSI Approved :: Apache Software License

        See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
        ********************************************************************************

!!
  self._finalize_license_expression()

(build link)

Establish CODEOWNERS

Proposes making @rapidsai/packaging-codeowners CODEOWNERS for this repo, so we'll get auto-assigned reviewers.

Update all pre-commit hooks

It's been a while, so I ran this:

pre-commit autoupdate

Alphabetize and reformat [tool.ruff.lint] table in pyproject.toml

Because we're using a CI run anyway and because formatting it like that makes it a bit easier to read (especially in git diff form) as the list of ruff rules grows to something like this: https://github.com/rapidsai/cudf/blob/9ebb19b30e6dbfae7921cb023552b5095e39a8f4/pyproject.toml#L51

[jameslamb]

TODO before merging:

• agree on the rules here
• get any necessary teams added as contributors

[bdice]

Happy to see this change. +1!

[bdice]

Happy to see this change. +1!

[gforsyth]

+1 from me. I'm going to merge this then configure the review assignment

[GPUtester]

🎉 This PR is included in version 1.20.2 🎉

The release is available on:

• GitHub release
• PyPI release
• Conda release - rapidsai
• Conda release - rapidsai-nightly

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