chore(deps): bump nixpkgs from 68a8af9 to 8a1b012 (#92)

Bumps [nixpkgs](https://github.com/nixos/nixpkgs) from `68a8af9` to `8a1b012`.
- [Commits](NixOS/nixpkgs@68a8af9...8a1b012)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 8a1b0127302ea51e05bf4ea5a291743fac442406
  dependency-type: direct:production
...

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Author: dependabot[bot]