Bump nix from 0.28.0 to 0.29.0

Bumps [nix](https://github.com/nix-rust/nix) from 0.28.0 to 0.29.0.
- [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
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -16,7 +16,7 @@ rust-version = "1.63"
 libc = "0.2.87"
 
 [target.'cfg(unix)'.dev-dependencies]
-nix = { version = "0.28.0", features = ["fs"] }
+nix = { version = "0.29.0", features = ["fs"] }
 
 [dev-dependencies]
 tempfile = "3.10.1"