`delete version` doesn't remove the owner if there are no more releases with that owner

[jyn514]

See for example https://docs.rs/crate/pioneer/0.0.1 which still says it was authored by @polygraphy. This may need #766 to fix.

Originally posted by @jyn514 in #837 (comment)

[Nemo157]

Ownership isn't linked to releases in any way, it's per-crate and mutable on crates.io. It just happens to only be updated from crates.io when we build a new release. We could add a update-crates-io-data to the CLI similar to the existing update-github-fields (though probably taking a crate name to update rather than updating all of them 🤣) (or just wait till that's handled by #766 as well).

[jyn514]

Ah I hadn't considered that ownership can change at any time. Yeah in that case I think we should make this part of #766 .