Deny: yaml-rust is unmaintained

[rdcm]

Config library config = "0.14.0" depend on rust-yaml unmaintained library:

error[unmaintained]: yaml-rust is unmaintained.
    │
322 │ yaml-rust 0.4.5 registry+https://github.com/rust-lang/crates.io-index
    │ ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ unmaintained advisory detected
    │
    ├ ID: RUSTSEC-2024-0320
    ├ Advisory: https://rustsec.org/advisories/RUSTSEC-2024-0320
    ├ The maintainer seems [unreachable](https://github.com/chyh1990/yaml-rust/issues/197).
      
      Many issues and pull requests have been submitted over the years
      without any [response](https://github.com/chyh1990/yaml-rust/issues/160).

This section in deny.toml must be removed:

[advisories]
ignore = ["RUSTSEC-2024-0320"] # https://rustsec.org/packages/yaml-rust.html

[rdcm]

Merged, but not released:
rust-cli/config-rs#567