build(deps): bump nixpkgs from 2f5a153 to 5b4f72e in the nix group

Bumps the nix group with 1 update: [nixpkgs](https://github.com/NixOS/nixpkgs).


Updates `nixpkgs` from `2f5a153` to `5b4f72e`
- [Commits](NixOS/nixpkgs@2f5a153...5b4f72e)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 5b4f72e1705a63aace42900610c4db82cb4af0ec
  dependency-type: direct:production
  dependency-group: nix
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]