Bump formidable and swagger-client in /samples/react-bot-framework

Removes [formidable](https://github.com/node-formidable/formidable). It's no longer used after updating ancestor dependency [swagger-client](https://github.com/swagger-api/swagger-js). These dependencies need to be updated together.


Removes `formidable`

Updates `swagger-client` from 2.2.21 to 3.27.0
- [Release notes](https://github.com/swagger-api/swagger-js/releases)
- [Changelog](https://github.com/swagger-api/swagger-js/blob/master/.releaserc)
- [Commits](https://github.com/swagger-api/swagger-js/commits/v3.27.0)

---
updated-dependencies:
- dependency-name: formidable
  dependency-type: indirect
- dependency-name: swagger-client
  dependency-type: direct:production
...

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