Bump laravel-mix from 6.0.37 to 6.0.38 in /frontend
Bump laravel-mix from 6.0.37 to 6.0.38 in /frontend

Bumps [laravel-mix](https://github.com/JeffreyWay/laravel-mix) from 6.0.37 to 6.0.38.
- [Release notes](https://github.com/JeffreyWay/laravel-mix/releases)
- [Changelog](https://github.com/laravel-mix/laravel-mix/blob/master/CHANGELOG.md)
- [Commits](https://github.com/JeffreyWay/laravel-mix/compare/v6.0.37...v6.0.38)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
firefly-iii/firefly-iii,firefly-iii/firefly-iii,firefly-iii/firefly-iii,firefly-iii/firefly-iii