Bump laravel/sail from 1.27.4 to 1.28.0 in /graph-tutorial

Bumps [laravel/sail](https://github.com/laravel/sail) from 1.27.4 to 1.28.0.
- [Release notes](https://github.com/laravel/sail/releases)
- [Changelog](https://github.com/laravel/sail/blob/1.x/CHANGELOG.md)
- [Commits](laravel/sail@v1.27.4...v1.28.0)

---
updated-dependencies:
- dependency-name: laravel/sail
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]