chore(deps-dev): bump postcss

Bumps the npm_and_yarn group with 1 update in the / directory: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.4.38 to 8.4.39
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.38...8.4.39)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  dependency-group: npm_and_yarn
...

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