build(deps): bump nix from 0.27.1 to 0.28.0 (#2108)

Bumps [nix](https://github.com/nix-rust/nix) from 0.27.1 to 0.28.0.
- [Changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md)
- [Commits](nix-rust/nix@v0.27.1...v0.28.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -107,7 +107,7 @@ zstd = "0.13"
 
 # dist-server only
 memmap2 = "0.9.4"
-nix = { version = "0.27.1", optional = true, features = [
+nix = { version = "0.28.0", optional = true, features = [
   "mount",
   "user",
   "sched",