Bump nixpkgs from 6b5e5b7 to 5c680da (#975)

Bumps [nixpkgs](https://github.com/nixos/nixpkgs) from `6b5e5b7` to `5c680da`.
- [Commits](NixOS/nixpkgs@6b5e5b7...5c680da)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 5c680dac9f02fe3ab5088be3a4d509d8a5b12430
  dependency-type: direct:production
...

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Author: dependabot[bot]