build(deps): bump nixpkgs-unstable from f9d8b65 to 4100e83

Bumps [nixpkgs-unstable](https://github.com/NixOS/nixpkgs) from `f9d8b65` to `4100e83`.
- [Commits](NixOS/nixpkgs@f9d8b65...4100e83)

---
updated-dependencies:
- dependency-name: nixpkgs-unstable
  dependency-version: 4100e830e085863741bc69b156ec4ccd53ab5be0
  dependency-type: direct:production
...

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Author: dependabot[bot]