Bump postcss in /docs in the npm_and_yarn group across 1 directory

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


Updates `postcss` from 8.5.10 to 8.5.22
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.10...8.5.22)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.22
  dependency-type: direct:production
  dependency-group: npm_and_yarn
...

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

Author: dependabot[bot]

docs/package-lock.json

@@ -36,6 +36,6 @@
     "postcss-cli": "^10.1.0"
   },
   "dependencies": {
-    "postcss": "^8.5.10"
+    "postcss": "^8.5.22"
   }
 }