Update nix requirement from 0.29 to 0.30

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@v0.29.0...v0.29.0)

---
updated-dependencies:
- dependency-name: nix
  dependency-version: 0.29.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.toml

@@ -39,7 +39,7 @@ corosensei = "0.2"
 core_affinity = "0.8"
 crossbeam-utils = "0.8"
 crossbeam-skiplist = "0.1"
-nix = "0.29"
+nix = "0.30"
 io-uring = "0.7"
 windows-sys = "0.59"
 anyhow = "1.0"