chore(deps-dev): bump postcss-loader in /generators/client/templates/vue
chore(deps-dev): bump postcss-loader in /generators/client/templates/vue

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 5.3.0 to 6.1.0.
- [Release notes](https://github.com/webpack-contrib/postcss-loader/releases)
- [Changelog](https://github.com/webpack-contrib/postcss-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/postcss-loader/compare/v5.3.0...v6.1.0)

---
updated-dependencies:
- dependency-name: postcss-loader
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
ruddell/generator-jhipster,ruddell/generator-jhipster,mraible/generator-jhipster,atomfrede/generator-jhipster,atomfrede/generator-jhipster,vivekmore/generator-jhipster,liseri/generator-jhipster,ruddell/generator-jhipster,pascalgrimaud/generator-jhipster,gmarziou/generator-jhipster,vivekmore/generator-jhipster,dynamicguy/generator-jhipster,jhipster/generator-jhipster,pascalgrimaud/generator-jhipster,jhipster/generator-jhipster,ctamisier/generator-jhipster,atomfrede/generator-jhipster,liseri/generator-jhipster,ctamisier/generator-jhipster,jhipster/generator-jhipster,vivekmore/generator-jhipster,mraible/generator-jhipster,vivekmore/generator-jhipster,gmarziou/generator-jhipster,dynamicguy/generator-jhipster,gmarziou/generator-jhipster,atomfrede/generator-jhipster,pascalgrimaud/generator-jhipster,ruddell/generator-jhipster,vivekmore/generator-jhipster,mraible/generator-jhipster,ctamisier/generator-jhipster,jhipster/generator-jhipster,mraible/generator-jhipster,jhipster/generator-jhipster,pascalgrimaud/generator-jhipster,atomfrede/generator-jhipster,dynamicguy/generator-jhipster,gmarziou/generator-jhipster,mraible/generator-jhipster,gmarziou/generator-jhipster,liseri/generator-jhipster,ruddell/generator-jhipster,ctamisier/generator-jhipster,liseri/generator-jhipster,ctamisier/generator-jhipster,liseri/generator-jhipster,dynamicguy/generator-jhipster,pascalgrimaud/generator-jhipster