build(deps-dev): bump fruitcake/laravel-debugbar from 4.2.6 to 4.2.8 (#547)

Bumps [fruitcake/laravel-debugbar](https://github.com/fruitcake/laravel-debugbar) from 4.2.6 to 4.2.8.
- [Release notes](https://github.com/fruitcake/laravel-debugbar/releases)
- [Changelog](https://github.com/fruitcake/laravel-debugbar/blob/master/CHANGELOG.md)
- [Commits](fruitcake/laravel-debugbar@v4.2.6...v4.2.8)

---
updated-dependencies:
- dependency-name: fruitcake/laravel-debugbar
  dependency-version: 4.2.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]