decode/verify throw up Errors thrown by jws.decode #837

Description

Sometimes decode, and in turn - verify, will throw Error instead of JsonWebTokenError. That makes it hard to distinguish errors in the calling code.

Reproduction

var jwt = require("jsonwebtoken")
const malformed_token='notbase64atall';

jwt.verify(
        malformed_token,
        'Secret',
        {
          algorithms: [ 'HS256' ],
        }
      );

Environment

• Version of this library used: 8.5.1
• Version of the platform or framework used, if applicable: https://github.com/auth0/node-jsonwebtoken/
• Other relevant versions (language, server software, OS, browser): NodeJS v10.20.1 (shouldn't be related)
• Other modules/plugins/libraries that might be involved: using it from NestJS project