Deny dependencies that don't pin an exact version

[SRv6d]

Is your feature request related to a problem? Please describe. It would be great if cargo deny could be configured to disallow dependencies that aren't pinned to an exact version (e.g. =1.0.0) for specific dependency groups.

Describe the solution you'd like I'd like to be able to configure cargo-deny to disallow non exact version specifiers for dev dependencies.