build(deps): bump postcss from 6.0.23 to 7.0.36

Bumps [postcss](https://github.com/postcss/postcss) from 6.0.23 to 7.0.36.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@6.0.23...7.0.36)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:production
...

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

Author: dependabot[bot]