Upgrade golang-jwt/jwt to v5

[brizaldi]

The dgrijalva/jwt-go is no longer maintained, and the development has been moved the a new repo golang-jwt/jwt.

However, the recent version of golang-jwt/jwt which is v5 has introduced a new breaking changes in the way Claims interface works.

While technically we can still use the v4, It would be very helpful if you can update this repo to support the v5 version.