fix(deps): update rust crate nix to 0.30

Author: renovate[bot]

Cargo.lock

@@ -200,7 +200,7 @@ shadowsocks = { version = "1.23.1", path = "../shadowsocks", default-features =
 
 # Just for the ioctl call macro
 [target.'cfg(any(target_os = "macos", target_os = "ios", target_os = "freebsd", target_os = "openbsd"))'.dependencies]
-nix = { version = "0.29", features = ["ioctl"] }
+nix = { version = "0.30", features = ["ioctl"] }
 
 [target.'cfg(windows)'.dependencies]
 windows-sys = { version = "0.59", features = ["Win32_Networking_WinSock"] }