Bump json5 and postcss-loader

Removes [json5](https://github.com/json5/json5). It's no longer used after updating ancestor dependency [postcss-loader](https://github.com/webpack-contrib/postcss-loader). These dependencies need to be updated together.


Removes `json5`

Updates `postcss-loader` from 3.0.0 to 7.0.2
- [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/v3.0.0...v7.0.2)

---
updated-dependencies:
- dependency-name: json5
  dependency-type: indirect
- dependency-name: postcss-loader
  dependency-type: direct:development
...

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