chore(deps): update nix requirement from 0.28.0 to 0.29.0 (#82)

Updates the requirements on [nix](https://github.com/nix-rust/nix) to permit the latest version.
- [Changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md)
- [Commits](nix-rust/nix@v0.28.0...v0.29.0)

---
updated-dependencies:
- dependency-name: nix
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -42,7 +42,7 @@ sysinfo = "0.30.12"
 textwrap = "0.16.1"
 
 [target.'cfg(target_family = "unix")'.dependencies]
-nix = { version = "0.28.0", features = ["signal"] }
+nix = { version = "0.29.0", features = ["signal"] }
 
 [dev-dependencies]
 assert_cmd = "2.0.14"