Bump laravel/horizon from 5.28.0 to 5.28.1 in the php-dependencies group

Bumps the php-dependencies group with 1 update: [laravel/horizon](https://github.com/laravel/horizon).


Updates `laravel/horizon` from 5.28.0 to 5.28.1
- [Release notes](https://github.com/laravel/horizon/releases)
- [Changelog](https://github.com/laravel/horizon/blob/5.x/CHANGELOG.md)
- [Commits](laravel/horizon@v5.28.0...v5.28.1)

---
updated-dependencies:
- dependency-name: laravel/horizon
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: php-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>