build(deps): update nix requirement in the cargo-crates group

Updates the requirements on [nix](https://github.com/nix-rust/nix) to permit the latest version.

Updates `nix` to 0.29.0
- [Changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nix-rust/nix/compare/v0.29.0...v0.29.0)

---
updated-dependencies:
- dependency-name: nix
  dependency-version: 0.29.0
  dependency-type: direct:production
  dependency-group: cargo-crates
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -83,7 +83,7 @@ libc = { version = "0.2.105", default-features = false }
 log = { version = "0.4", default-features = false }
 netns-rs = { version = "0.1", default-features = false }
 network-types = { version = "0.0.8", default-features = false }
-nix = { version = "0.29.0", default-features = false }
+nix = { version = "0.30.1", default-features = false }
 num_enum = { version = "0.7", default-features = false }
 object = { version = "0.36", default-features = false }
 once_cell = { version = "1.20.1", default-features = false }