chore(deps): bump nixpkgs from 1559d3d to e72e4f2

Bumps [nixpkgs](https://github.com/NixOS/nixpkgs) from `1559d3d` to `e72e4f2`.
- [Commits](NixOS/nixpkgs@1559d3d...e72e4f2)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: e72e4f299401a3689d4b3d5fc6496b11db7064eb
  dependency-type: direct:production
...

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Author: dependabot[bot]