Bump nix from 0.26.4 to 0.27.1

Bumps [nix](https://github.com/nix-rust/nix) from 0.26.4 to 0.27.1.
- [Changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nix-rust/nix/compare/v0.26.4...v0.27.1)

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

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

Cargo.toml

@@ -114,7 +114,7 @@ sd-notify = { version = "0.4.1", optional = true }
 js_option = "0.1"
 
 [target.'cfg(unix)'.dependencies]
-nix = { version = "0.26.2", features = ["resource"] }
+nix = { version = "0.27.1", features = ["resource"] }
 
 [features]
 default = ["conduit_bin", "backend_rocksdb", "systemd", "zstd_compression"]