Bump laravel/horizon from 5.42.0 to 5.43.0 (#340)

Bumps [laravel/horizon](https://github.com/laravel/horizon) from 5.42.0 to 5.43.0.
- [Release notes](https://github.com/laravel/horizon/releases)
- [Changelog](https://github.com/laravel/horizon/blob/5.x/CHANGELOG.md)
- [Commits](laravel/horizon@v5.42.0...v5.43.0)

---
updated-dependencies:
- dependency-name: laravel/horizon
  dependency-version: 5.43.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]