Deprecated license specification in pyproject.toml

[spmeisburger]

When installing mdx2, I get following warning:

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.

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