Bump jsonwebtoken and botframework-connector in /example

Bumps [jsonwebtoken](https://github.com/auth0/node-jsonwebtoken) and [botframework-connector](https://github.com/Microsoft/botbuilder-js). These dependencies needed to be updated together.

Updates `jsonwebtoken` from 8.0.1 to 9.0.0
- [Release notes](https://github.com/auth0/node-jsonwebtoken/releases)
- [Changelog](https://github.com/auth0/node-jsonwebtoken/blob/master/CHANGELOG.md)
- [Commits](auth0/node-jsonwebtoken@v8.0.1...v9.0.0)

Updates `botframework-connector` from 4.2.0 to 4.19.1
- [Release notes](https://github.com/Microsoft/botbuilder-js/releases)
- [Commits](microsoft/botbuilder-js@4.2...4.19.1)

---
updated-dependencies:
- dependency-name: jsonwebtoken
  dependency-type: indirect
- dependency-name: botframework-connector
  dependency-type: indirect
...

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Author: dependabot[bot]