Bumps [nix](https://github.com/nix-rust/nix) from 0.16.0 to 0.16.1. - [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/commits) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>