Bump @aws-amplify/ui-react from 2.16.2 to 3.4.0 in /src/react-frontend

Bumps [@aws-amplify/ui-react](https://github.com/aws-amplify/amplify-ui/tree/HEAD/packages/react) from 2.16.2 to 3.4.0.
- [Release notes](https://github.com/aws-amplify/amplify-ui/releases)
- [Changelog](https://github.com/aws-amplify/amplify-ui/blob/main/packages/react/CHANGELOG.md)
- [Commits](https://github.com/aws-amplify/amplify-ui/commits/@aws-amplify/[email protected]/packages/react)

---
updated-dependencies:
- dependency-name: "@aws-amplify/ui-react"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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