build(deps): bump kalnoy/nestedset from 6.0.6 to 6.0.7

Bumps [kalnoy/nestedset](https://github.com/lazychaser/laravel-nestedset) from 6.0.6 to 6.0.7.
- [Release notes](https://github.com/lazychaser/laravel-nestedset/releases)
- [Changelog](https://github.com/lazychaser/laravel-nestedset/blob/v6/CHANGELOG.markdown)
- [Commits](lazychaser/laravel-nestedset@v6.0.6...v6.0.7)

---
updated-dependencies:
- dependency-name: kalnoy/nestedset
  dependency-version: 6.0.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]