chore(deps): bump nixpkgs from 4100e83 to 4df1b88 (#27)

Bumps [nixpkgs](https://github.com/NixOS/nixpkgs) from `4100e83` to `4df1b88`.
- [Commits](NixOS/nixpkgs@4100e83...4df1b88)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 4df1b885d76a54e1aa1a318f8d16fd6005b6401f
  dependency-type: direct:production
...

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