Function check_outdated_with_versions 

pub fn check_outdated_with_versions(
    manifest: &Manifest,
    lock: &LockFile,
    version_lookup: &dyn Fn(&str) -> Result<Vec<String>, String>,
) -> Result<Vec<OutdatedInfo>, String>

Check which dependencies are outdated. Accepts a version lookup closure for testability without a live registry.

version_lookup(name) should return a list of available version strings.