chore(deps): bump nixpkgs from cd4ea8d to 718f670 (#43)

Bumps [nixpkgs](https://github.com/NixOS/nixpkgs) from `cd4ea8d` to `718f670`.
- [Commits](NixOS/nixpkgs@cd4ea8d...718f670)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 718f670e845328e9c2cecdd832835712b2cbd065
  dependency-type: direct:production
...

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Author: dependabot[bot]