Update nix to version 0.23 since 0.22 is marked vulnerable:

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

Author: eldruin

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 ### Changed
 
-- Updated nix to allow both version `0.22` or `0.23`.
+- Updated nix to version `0.23`.
 
 ## [0.6.0] - 2021-09-24
 

Cargo.toml

@@ -19,7 +19,7 @@ async-tokio = ["futures", "tokio", "mio-evented"]
 
 [dependencies]
 futures = { version = "0.3", optional = true }
-nix = ">= 0.22, < 0.24"
+nix = "0.23"
 mio = { version = "0.7", optional = true, features = ["os-ext"]}
 tokio = { version = "1", optional = true, features = ["net"] }