Bump postcss from 8.4.45 to 8.4.47

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.45 to 8.4.47.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.45...8.4.47)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -40,7 +40,7 @@
  "@web/test-runner": "^0.19.0",
  "eslint": "^8.57.0",
  "open-props": "^1.7.6",
- "postcss": "^8.4.45",
+ "postcss": "^8.4.47",
  "postcss-cli": "^11.0.0",
  "postcss-import": "^16.1.0",
  "postcss-jit-props": "^1.0.14",