chore: bump nixpkgs from 0c88e1f to 8fd9daa in the nix group (#42)

Bumps the nix group with 1 update: [nixpkgs](https://github.com/NixOS/nixpkgs).


Updates `nixpkgs` from `0c88e1f` to `8fd9daa`
- [Commits](NixOS/nixpkgs@0c88e1f...8fd9daa)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 8fd9daa3db09ced9700431c5b7ad0e8ba199b575
  dependency-type: direct:production
  dependency-group: nix
...

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Author: dependabot[bot]