Bump yargs-parser and laravel-mix

Bumps [yargs-parser](https://github.com/yargs/yargs-parser) to 13.1.2 and updates ancestor dependency [laravel-mix](https://github.com/JeffreyWay/laravel-mix). These dependencies need to be updated together.


Updates `yargs-parser` from 11.1.1 to 13.1.2
- [Release notes](https://github.com/yargs/yargs-parser/releases)
- [Changelog](https://github.com/yargs/yargs-parser/blob/main/docs/CHANGELOG-full.md)
- [Commits](https://github.com/yargs/yargs-parser/commits)

Updates `laravel-mix` from 5.0.4 to 5.0.9
- [Release notes](https://github.com/JeffreyWay/laravel-mix/releases)
- [Changelog](https://github.com/laravel-mix/laravel-mix/blob/master/CHANGELOG.md)
- [Commits](laravel-mix/laravel-mix@v5.0.4...v5.0.9)

---
updated-dependencies:
- dependency-name: yargs-parser
  dependency-type: indirect
- dependency-name: laravel-mix
  dependency-type: direct:development
...

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

Author: dependabot[bot]