website: bump postcss from 8.4.45 to 8.4.47 in /website (#11390)

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:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

website/package-lock.json

@@ -28,7 +28,7 @@
         "disqus-react": "^1.1.5",
         "docusaurus-plugin-openapi-docs": "^4.0.0",
         "docusaurus-theme-openapi-docs": "^4.0.1",
-        "postcss": "^8.4.45",
+        "postcss": "^8.4.47",
         "prism-react-renderer": "^2.4.0",
         "react": "^18.3.1",
         "react-before-after-slider-component": "^1.1.8",