build(deps): bump nix from 0.19.0 to 0.19.1

Bumps [nix](https://github.com/nix-rust/nix) from 0.19.0 to 0.19.1.
- [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/compare/v0.19.0...v0.19.1)

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

Cargo.toml

@@ -78,7 +78,7 @@ winapi = { version = "0.3", features = [
 ] }
 
 [target.'cfg(not(windows))'.dependencies]
-nix = "0.19.0"
+nix = "0.19.1"
 
 [dev-dependencies]
 tempfile = "3.1.0"