Update Rust crate nix to 0.30

Author: renovate[bot]

src/Cargo.toml

@@ -40,7 +40,7 @@ hmac = { version = "0.12", default-features = false }
 httparse = { version = "1.9.4", default-features = false }
 lazy_static = "1.4"
 libc = "=0.2.172"
-nix = { version = "0.26", features = ["socket"], default-features = false }
+nix = { version = "0.30", features = ["socket"], default-features = false }
 p256 = { version = "0.12.0", default-features = false }
 p384 = { version = "0.13", features = ["ecdsa", "std"], default-features = false }
 rand = "0.9"