Bump react-bootstrap from 1.6.8 to 2.10.10 in /example

Bumps [react-bootstrap](https://github.com/react-bootstrap/react-bootstrap) from 1.6.8 to 2.10.10.
- [Release notes](https://github.com/react-bootstrap/react-bootstrap/releases)
- [Changelog](https://github.com/react-bootstrap/react-bootstrap/blob/v2.10.10/CHANGELOG.md)
- [Commits](react-bootstrap/react-bootstrap@v1.6.8...v2.10.10)

---
updated-dependencies:
- dependency-name: react-bootstrap
  dependency-version: 2.10.10
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]