build(deps-dev): bump postcss

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


Updates `postcss` from 8.5.18 to 8.5.23
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.18...8.5.23)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.25
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: actions-deps
...

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Author: dependabot[bot]