chore(deps): update nix flake.lock (#70)

Automated changes by the
[update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock)
GitHub Action.

```
Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/dd9b079222d43e1943b6ebd802f04fd959dc8e61?narHash=sha256-I45esRSssFtJ8p/gLHUZ1OUaaTaVLluNkABkk6arQwE%3D' (2026-02-27)
  → 'github:NixOS/nixpkgs/8110df5ad7abf5d4c0f6fb0f8f978390e77f9685?narHash=sha256-D3Q07BbIA2KnTcSXIqqu9P586uWxN74zNoCH3h2ESHg%3D' (2026-03-28)
```

### Running GitHub Actions on this PR

GitHub Actions will not run workflows on pull requests which are opened
by a GitHub Action.

**To run GitHub Actions workflows on this PR, close and re-open this
pull request.**

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]