build(deps): update nix requirement from 0.26.2 to 0.27.0

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](https://github.com/nix-rust/nix/compare/v0.26.2...v0.26.3)

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

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

Cargo.toml

@@ -73,7 +73,7 @@ lazy_static = { version = "1", default-features = false }
 libc = { version = "0.2.105", default-features = false }
 log = { version = "0.4", default-features = false }
 netns-rs = { version = "0.1", default-features = false }
-nix = { version = "0.26.2", default-features = false }
+nix = { version = "0.27.0", default-features = false }
 num_enum = { version = "0.7", default-features = false }
 object = { version = "0.32", default-features = false }
 proc-macro-error = { version = "1.0", default-features = false }