Update nix requirement from 0.24.1 to 0.26.2

Updates the requirements on [nix](https://github.com/nix-rust/nix) to permit the latest version.
- [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@v0.24.1...v0.26.2)

---
updated-dependencies:
- dependency-name: nix
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -21,7 +21,7 @@ failure = "0.1.8"
 serial = {version = "0.4.0"}
 rust-uart = { git = "ssh://git@github.com/Cube-OS/rust-uart"}
 # APP activate for nix only
-nix = { version = "0.24.1", optional = true}
+nix = { version = "0.26.2", optional = true}
 # Syslog
 syslog = { version = "^6.0.1"} 
 # Database only activate for Database for now