PEP 808: include METADATA bump

[henryiii]

Signed-off-by: Henry Schreiner henryfs@princeton.edu

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This updates PEP 808 with a METADATA bump. This applies the same rules to METADATA that we are setting up for pyproject.toml. There was one potential downside: before, you could put any arbitrary metadata you wanted in METADATA if a field was marked as dynamic. After discussing this with @LecrisUT, we decided that was likely a reasonable restriction; there's not much you can do with this (if it's marked as dynamic, you need to compute it anyway if you have an SDist), and for all the fields present, it's not clear any of them would benefit from being "SDist-only" anyway.

@pfmoore needs to review/approve.

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📚 Documentation preview 📚: https://pep-previews--4849.org.readthedocs.build/