Bump postcss from 8.5.6 to 8.5.10 in /site

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.6 to 8.5.10.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.6...8.5.10)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.10
  dependency-type: direct:development
...

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

Author: dependabot[bot]

site/package-lock.json

@@ -19,7 +19,7 @@
     "@types/node": "^25.3.2",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.0.0",
-    "postcss": "^8.5.0",
+    "postcss": "^8.5.10",
     "tailwindcss": "^4.0.0",
     "typescript": "^5.7.0"
   }