Bump nix from 0.24.2 to 0.26.2

Bumps [nix](https://github.com/nix-rust/nix) from 0.24.2 to 0.26.2.
- [Release notes](https://github.com/nix-rust/nix/releases)
- [Changelog](https://github.com/nix-rust/nix/blob/v0.26.2/CHANGELOG.md)
- [Commits](nix-rust/nix@v0.24.2...v0.26.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -10,5 +10,5 @@ documentation = "https://github.com/nix-community/nix-user-chroot"
 repository = "https://github.com/nix-community/nix-user-chroot"
 
 [dependencies]
-nix = "0.24.2"
+nix = "0.26.2"
 libc = "0.2.139"