chore(deps-dev): bump postcss from 8.5.14 to 8.5.23 (#3144)

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.14 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@8.5.14...8.5.23)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.23
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -65,7 +65,7 @@
     "@types/whatwg-url": "^11.0.0",
     "@web/test-runner-chrome": "^1.0.0",
     "@web/test-runner-core": "^1.0.0",
-    "postcss": "^8.5.14",
+    "postcss": "^8.5.23",
     "rollup-plugin-postcss": "^4.0.2"
   }
 }