Upgrade jwt library

[lwsanty]

andygrunwald#343

https://github.com/dgrijalva/jwt-go has been abondoned (see dgrijalva/jwt-go#462). In order to fix the vulnarability we have to switch to a community driven fork https://github.com/golang-jwt/jwt . The issue has been fixed in golang-jwt/jwt#12

(cherry picked from commit fff481a)

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