website: bump postcss from 8.4.23 to 8.4.24 in /website (#5783)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.23 to 8.4.24.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.23...8.4.24)

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

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

website/package.json

@@ -22,7 +22,7 @@
         "@mdx-js/react": "^1.6.22",
         "clsx": "^1.2.1",
         "disqus-react": "^1.1.5",
-        "postcss": "^8.4.23",
+        "postcss": "^8.4.24",
         "rapidoc": "^9.3.4",
         "react": "^17.0.2",
         "react-before-after-slider-component": "^1.1.8",