Bump react from 16.14.0 to 18.2.0 in /_examples/chat

Bumps [react](https://github.com/facebook/react/tree/HEAD/packages/react) from 16.14.0 to 18.2.0.
- [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/v18.2.0/packages/react)

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

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

_examples/chat/package.json

@@ -9,7 +9,7 @@
     "graphql-sse": "^2.0.0",
     "graphql-tag": "^2.10.0",
     "graphql-ws": "^5.8.1",
-    "react": "^16.6.3",
+    "react": "^18.2.0",
     "react-dom": "^16.6.3",
     "react-scripts": "^5.0.1",
     "styled-components": "^6.1.8",