chore(nix): bump nixpkgs from 8fd9daa to d7a713c (#65)

Bumps [nixpkgs](https://github.com/NixOS/nixpkgs) from `8fd9daa` to `d7a713c`.
- [Commits](NixOS/nixpkgs@8fd9daa...d7a713c)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: d7a713c0b7e47c908258e71cba7a2d77cc8d71d5
  dependency-type: direct:production
...

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