build(deps): bump nurpkgs from 86ec9bd to 6c20e64

Bumps [nurpkgs](https://github.com/josh/nurpkgs) from `86ec9bd` to `6c20e64`.
- [Commits](josh/nurpkgs@86ec9bd...6c20e64)

---
updated-dependencies:
- dependency-name: nurpkgs
  dependency-version: 6c20e6452b37e1c94e6145cbdc974631f59d8df3
  dependency-type: direct:production
...

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Author: dependabot[bot]