Non-sequential acceptance and implementation of new Core Metadata features and changes

[CAM-Gerlach]

Opened as

RFC: Remove explicit suggestion that producers use outdated core metadata versions for compat purposes

Presently, the Metadata-Version section of the core metadata spec states: For broader compatibility, build tools MAY choose to produce distribution metadata using the lowest metadata version that includes all of the needed fields. Following discussion on PEP 685’s thread and related conversations on metadata-version, it seemed prudent to simply remove this. It implies that there are multiple discrete, current, valid versions of the spec at any given time, rather than just one canonical ver…