build(deps): bump react-dom from 18.3.1 to 19.2.3 in /site

Bumps [react-dom](https://github.com/facebook/react/tree/HEAD/packages/react-dom) from 18.3.1 to 19.2.3.
- [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/v19.2.3/packages/react-dom)

---
updated-dependencies:
- dependency-name: react-dom
  dependency-version: 19.2.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

site/package-lock.json

@@ -11,7 +11,7 @@
     "@morganstanley/gatsby-theme-ms-gh-pages": "^1.1.2",
     "gatsby": "^5.15.0",
     "react": "^18.3.1",
-    "react-dom": "^18.3.1"
+    "react-dom": "^19.2.3"
   },
   "overrides": {
     "axios": "^1.7.4",