chore(deps): bump nixpkgs from 01fbdee to 73c703c

Bumps [nixpkgs](https://github.com/nixos/nixpkgs) from `01fbdee` to `73c703c`.
- [Commits](NixOS/nixpkgs@01fbdee...73c703c)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 73c703c22422b8951895a960959dbbaca7296492
  dependency-type: direct:production
...

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

Author: dependabot[bot]