chore(deps): bump nixpkgs from c6e5ca3 to 48d91f2

Bumps [nixpkgs](https://github.com/NixOS/nixpkgs) from `c6e5ca3` to `48d91f2`.
- [Commits](NixOS/nixpkgs@c6e5ca3...48d91f2)

---
updated-dependencies:
- dependency-name: nixpkgs
  dependency-version: 48d91f2c0ce7b9e589f967d4f685153dd765dcdd
  dependency-type: direct:production
...

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Author: dependabot[bot]