Bump nix from 0.21.0 to 0.22.0

Bumps [nix](https://github.com/nix-rust/nix) from 0.21.0 to 0.22.0.
- [Release notes](https://github.com/nix-rust/nix/releases)
- [Changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nix-rust/nix/commits)

---
updated-dependencies:
- dependency-name: nix
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

crates/shadowsocks-service/Cargo.toml

@@ -112,7 +112,7 @@ shadowsocks = { version = "1.11.2", path = "../shadowsocks" }
 
 # Just for the ioctl call macro
 [target.'cfg(any(target_os = "macos", target_os = "ios", target_os = "freebsd", target_os = "netbsd", target_os = "openbsd"))'.dependencies]
-nix = "0.21"
+nix = "0.22"
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3", features = ["mswsock", "winsock2"] }

crates/shadowsocks/Cargo.toml

@@ -73,7 +73,7 @@ winapi = { version = "0.3", features = ["mswsock", "winsock2"] }
 
 # Just for the ioctl call macro
 [target.'cfg(any(target_os = "linux", target_os = "android"))'.dependencies]
-nix = "0.21"
+nix = "0.22"
 
 [dev-dependencies]
 env_logger = "0.8"