jwt-go needs to uplift to 4.0.0-prview1 or later to fix some security issue

[zmaxyan]

From CVE-2020-26160:
jwt-go before 4.0.0-preview1 allows attackers to bypass intended access restrictions in situations with []string{} for m["aud"] (which is allowed by the specification). Because the type assertion fails, "" is the value of aud. This is a security problem if the JWT token is presented to a service that lacks its own audience check.

[brackendawson]

The dependency is now maintained at github.com/golang-jwt/jwt and v3.2.1 contains the fix. I think we should add this to the 2.7.2 milestone.

[milosgajdos]

Closing this as it should be fixed by #3138

Feel free to reopen if you disagree. 2.7.x fix is tracked under #3465