Update @testing-library/react to v16 for React 19 compatibility

Co-authored-by: bajoski34 <39011309+bajoski34@users.noreply.github.com>

Author: Copilot

example/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "dependencies": {
     "@testing-library/jest-dom": "^6.0.0",
-    "@testing-library/react": "^14.0.0",
+    "@testing-library/react": "^16.0.0",
     "@testing-library/user-event": "^14.0.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",