chore(deps-dev): bump @types/react-dom in /testsite

Bumps [@types/react-dom](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-dom) from 19.2.2 to 19.2.3.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react-dom)

---
updated-dependencies:
- dependency-name: "@types/react-dom"
  dependency-version: 19.2.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

testsite/package-lock.json

@@ -32,7 +32,7 @@
     "@docusaurus/module-type-aliases": "3.9.2",
     "@docusaurus/tsconfig": "3.9.2",
     "@types/react": "^19.2.0",
-    "@types/react-dom": "^19.2.2",
+    "@types/react-dom": "^19.2.3",
     "typescript": "^5.6.2"
   },
   "browserslist": {