fix: stop deriving Debug for Endpoint

[poroh]

Endpoint contains BMC credentials, including password, so deriving Debug makes it easier to accidentally expose secrets in logs or error output.

Remove the Debug derive from Endpoint to avoid accidental credential leakage.

[krish-nvidia]

Can you fix this one too in crates/libnmxm/src/lib.rs (nvm, wrong repo...)

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Endpoint {
    pub host: String,
    pub username: Option<String>,
    pub password: Option<String>,
}