build(deps): bump the nix group across 1 directory with 2 updates

Bumps the nix group with 2 updates in the / directory: [nixify](https://github.com/rvolosatovs/nixify) and [nixpkgs-unstable](https://github.com/NixOS/nixpkgs).


Updates `nixify` from `e4eb22b` to `5a628e2`
- [Release notes](https://github.com/rvolosatovs/nixify/releases)
- [Commits](rvolosatovs/nixify@e4eb22b...5a628e2)

Updates `nixpkgs-unstable` from `5545adf` to `d5dfd8e`
- [Commits](NixOS/nixpkgs@5545adf...d5dfd8e)

---
updated-dependencies:
- dependency-name: nixify
  dependency-version: 5a628e24b20e75dc5bf8be5e9d7236476f5033ed
  dependency-type: direct:production
  dependency-group: nix
- dependency-name: nixpkgs-unstable
  dependency-version: d5dfd8e6716dde34398bc14bc87c10dece9c8c68
  dependency-type: direct:production
  dependency-group: nix
...

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Author: dependabot[bot]