Updated jsonwebtoken dependency to ^8.3.0

[ryangiglio]

Version 4.2.2 has a critical security vulnerability

https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/

[bluepnume]

Hello all.

This module is no longer being actively maintained as part of the krakenjs org. We will likely be closing this repo. If you want to take ownership of the repo and maintain it going forwards, please reach out to me.