Support workspace inheritance

[Muscraft]

Workspace inheritance was stabilized recently and set to be released in 1.64 on September 22, 2022. Currently cargo-outdated does not support the use of workspace inheritance and throws an error. It would be nice if this could be fixed before workspace inheritance is released but it might not be possible until the correct cargo version is released.

[robjtede]

the day has come, cargo-outdated now instantly fails on packages with workspace inherited properties

[domenicquirl]

This is indeed a bummer. I just ran into the same issue in cargo-udeps (est31/cargo-udeps#140) and now here. Would it be possible to update the cargo dependency and resolve this?

[Muscraft]

I don't think just updating cargo will help. It will make it so it won't error when encountering workspace inheritance but it won't actually check for updates in [workspace.dependencies].