chore: bump react from 19.2.0 to 19.2.1 in /site

Bumps [react](https://github.com/facebook/react/tree/HEAD/packages/react) from 19.2.0 to 19.2.1.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v19.2.1/packages/react)

---
updated-dependencies:
- dependency-name: react
  dependency-version: 19.2.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

site/package-lock.json

@@ -24,7 +24,7 @@
     "@mdx-js/react": "^3.1.1",
     "clsx": "^2.1.1",
     "prism-react-renderer": "^2.4.1",
-    "react": "^19.2.0",
+    "react": "^19.2.1",
     "react-dom": "^19.2.0"
   },
   "devDependencies": {