Filter out versions not compatible with current Rust version

[tyilo]

Similar to what adding the following to .cargo/config.toml does:

[resolver]
incompatible-rust-versions = "fallback"

This could either be done with a new flag or by reading the users .cargo/config.toml.

[davidhewitt]

I think this is currently a nightly-only flag?

[tyilo]

I think this is currently a nightly-only flag?

Nope, this was stabilized in Cargo 1.84.0: https://blog.rust-lang.org/2025/01/09/Rust-1.84.0.html#cargo-considers-rust-versions-for-dependency-version-selection