chore: bump nix from 0.25.1 to 0.29.0 (#614)

Bumps [nix](https://github.com/nix-rust/nix) from 0.25.1 to 0.29.0.
- [Changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md)
- [Commits](nix-rust/nix@v0.25.1...v0.29.0)

---
updated-dependencies:
- dependency-name: nix
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot]
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Author: dependabot[bot]

Cargo.lock

@@ -21,7 +21,7 @@ name = "sk"
 path = "src/bin/main.rs"
 
 [dependencies]
-nix = "0.25.0"
+nix = "0.29.0"
 atty = { version = "0.2.14", optional = true }
 regex = "1.6.0"
 lazy_static = "1.4.0"