build(deps): bump treefmt-nix from 2eddae0 to db94781 in /tests

Bumps [treefmt-nix](https://github.com/numtide/treefmt-nix) from `2eddae0` to `db94781`.
- [Commits](numtide/treefmt-nix@2eddae0...db94781)

---
updated-dependencies:
- dependency-name: treefmt-nix
  dependency-version: db947814a175b7ca6ded66e21383d938df01c227
  dependency-type: direct:production
...

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Author: dependabot[bot]