Bump nix from 0.25.0 to 0.26.1

Bumps [nix](https://github.com/nix-rust/nix) from 0.25.0 to 0.26.1.
- [Release notes](https://github.com/nix-rust/nix/releases)
- [Changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md)
- [Commits](nix-rust/nix@v0.25.0...v0.26.1)

---
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

@@ -126,7 +126,7 @@ shadowsocks = { version = "1.15.0", path = "../shadowsocks", default-features =
 
 # 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 = "0.25"
+nix = "0.26"
 
 [target.'cfg(windows)'.dependencies]
 windows-sys = { version = "0.42", features = ["Win32_Networking_WinSock"] }