chore(deps): bump nixpkgs from 15f4ee4 to 549bd84 (#14)

Bumps [nixpkgs](https://github.com/NixOS/nixpkgs) from `15f4ee4` to `549bd84`.
- [Commits](NixOS/nixpkgs@15f4ee4...549bd84)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 549bd84d6279f9852cae6225e372cc67fb91a4c1
  dependency-type: direct:production
...

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Author: dependabot[bot]