[BUG] config crate relies on unmaintained package

[wilyle]

The config crate relies on an unmaintained crate (yaml-rust). This crate either needs to be updated or replaced to eliminate the security alert that it generates.

This was originally detected in #167 , where the warning was ignored in .github/workflows/security_audit.yaml.

References:

• Remove YAML support rust-cli/config-rs#473
• https://rustsec.org/advisories/RUSTSEC-2024-0320

Tasks:

• config crate is updated or replaced and the yaml-rust crate is no longer part of the dependency tree
• security_audit.yaml is updated to remove the ignored advisory