Bump laravel/pint from 1.18.1 to 1.18.2 in /graph-tutorial

Bumps [laravel/pint](https://github.com/laravel/pint) from 1.18.1 to 1.18.2.
- [Release notes](https://github.com/laravel/pint/releases)
- [Changelog](https://github.com/laravel/pint/blob/main/CHANGELOG.md)
- [Commits](laravel/pint@v1.18.1...v1.18.2)

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

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

Author: dependabot[bot]