Compatibility with workspace inheritance

[max-sixty]

Related to https://github.com/foresterre/cargo-msrv/issues/295, but I think not the same.

Currently running cargo msrv verify on https://github.com/prql/prql within prql-compiler raises an error:

❯ cargo msrv verify
Fetching index
Unable to find key 'package.rust-version' (or 'package.metadata.msrv') in '/Users/maximilian/workspace/prql/prql-compiler/Cargo.toml'

I think that's because we use workspace inheritance, taking the rust version from the workspace.

Is that something that could be supported?

Thanks!