Setuptools warnings (license metadata)

[jakirkham]

Seeing a bunch of warnings from Setuptools in CI:

SetuptoolsDeprecationWarning: `project.license` as a TOML table is deprecated
...
SetuptoolsDeprecationWarning: 'tool.setuptools.license-files' is deprecated in favor of 'project.license-files' (available on setuptools>=77.0.0).
...
SetuptoolsDeprecationWarning: License classifiers are deprecated.

These mainly pertain to changes around how license metadata is being handled