Update nix to version 0.23 since 0.22 is marked vulnerable:

https://rustsec.org/advisories/RUSTSEC-2021-0119.html

Author: eldruin

CHANGELOG.md

@@ -8,7 +8,7 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
-- Updated nix to allow both version `0.22` or `0.23`.
+- Updated nix to version `0.23`.
 
 ## [v0.5.0] - 2021-09-21
 

Cargo.toml

@@ -22,7 +22,7 @@ required-features = ["async-tokio"]
 [dependencies]
 bitflags = "1.3"
 libc = "0.2"
-nix = ">= 0.22, < 0.24"
+nix = "0.23"
 tokio = { version = "1", features = ["io-std", "net"], optional = true }
 futures = { version = "0.3", optional = true }