Bump laravel/nightwatch in the php-dependencies group (#391)

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


Updates `laravel/nightwatch` from 1.14.0 to 1.15.0
- [Release notes](https://github.com/laravel/nightwatch/releases)
- [Changelog](https://github.com/laravel/nightwatch/blob/1.x/CHANGELOG.md)
- [Commits](laravel/nightwatch@v1.14.0...v1.15.0)

---
updated-dependencies:
- dependency-name: laravel/nightwatch
  dependency-version: 1.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: php-dependencies
...

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Author: dependabot[bot]