Bump glob-parent and postcss-cli in /themes/docuapi

Bumps [glob-parent](https://github.com/gulpjs/glob-parent) to 5.1.2 and updates ancestor dependency [postcss-cli](https://github.com/postcss/postcss-cli). These dependencies need to be updated together.


Updates `glob-parent` from 3.1.0 to 5.1.2
- [Release notes](https://github.com/gulpjs/glob-parent/releases)
- [Changelog](https://github.com/gulpjs/glob-parent/blob/main/CHANGELOG.md)
- [Commits](gulpjs/glob-parent@v3.1.0...v5.1.2)

Updates `postcss-cli` from 6.1.3 to 10.1.0
- [Release notes](https://github.com/postcss/postcss-cli/releases)
- [Changelog](https://github.com/postcss/postcss-cli/blob/master/CHANGELOG.md)
- [Commits](postcss/postcss-cli@6.1.3...10.1.0)

---
updated-dependencies:
- dependency-name: glob-parent
  dependency-type: indirect
- dependency-name: postcss-cli
  dependency-type: direct:development
...

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