Add support for wildcard dependencies for bin crates

[nitnelave]

I'm publishing crates for my app (https://github.com/lldap/lldap) to facilitate debian packaging. I was trying to use your action, but I immediately ran into:
Error: Error: Missing dependency 'anyhow' version field

This is fine as an error for libs, but for bin crates it's okay (the dependencies are locked in the checked-in Cargo.lock).

Right now I'm working around the error by setting specific versions in Cargo.toml, but it's not ideal (I'd like to be able to do cargo update and update all my dependencies).

[nitnelave]

Also, the error message could be clearer :) I had no idea what it meant, or even that it was from this action (I thought it was from cargo metadata, the last command that ran).
I had to look into the code to see that it didn't like the wildcard.

[nitnelave]

It was brought to my attention that crates.io doesn't allow wildcard versions at all. I'll just leave this open for the error message, then.