build(deps): bump kalnoy/nestedset from 6.0.3 to 6.0.4 (#717)

Bumps [kalnoy/nestedset](https://github.com/lazychaser/laravel-nestedset) from 6.0.3 to 6.0.4.
- [Release notes](https://github.com/lazychaser/laravel-nestedset/releases)
- [Changelog](https://github.com/lazychaser/laravel-nestedset/blob/v6/CHANGELOG.markdown)
- [Commits](lazychaser/laravel-nestedset@v6.0.3...v6.0.4)

---
updated-dependencies:
- dependency-name: kalnoy/nestedset
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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