chore: bump nix from 0.19.0 to 0.20.0 (#17853)

* chore: bump nix from 0.19.0 to 0.20.0

Bumps [nix](https://github.com/nix-rust/nix) from 0.19.0 to 0.20.0.
- [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/compare/v0.19.0...v0.20.0)

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

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

* [auto-commit] Update all Cargo lock files

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: dependabot-buildkite <dependabot-buildkite@noreply.solana.com>

net-utils/Cargo.toml

@@ -13,7 +13,7 @@ edition = "2018"
 bincode = "1.3.1"
 clap = "2.33.1"
 log = "0.4.11"
-nix = "0.19.0"
+nix = "0.20.0"
 rand = "0.7.0"
 serde = "1.0.126"
 serde_derive = "1.0.103"