Update nix requirement from 0.27.1 to 0.30.1

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@v0.27.1...v0.30.1)

---
updated-dependencies:
- dependency-name: nix
  dependency-version: 0.30.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

bmap-rs/Cargo.toml

@@ -13,7 +13,7 @@ readme = "../README.md"
 [dependencies]
 bmap-parser = { path = "../bmap-parser", version = "0.2.0"}
 anyhow = "1.0.66"
-nix = { version = "0.27.1", features = ["fs"] }
+nix = { version = "0.30.1", features = ["fs"] }
 flate2 = "1.0.24"
 clap = { version = "~4.4.0", features = ["cargo"] }
 indicatif = { version = "0.17.1", features = ["tokio"] }