upgrade gin-jwt version to 2.7.0 to get greater security

[zhijian-pro]

don't keep use dgrijalva/jwt-go

There are many security issue from dgrijalva/jwt-go, which is not maintained, we should switch to community maintained golang-jwt/jwt
the gin-jwt v2.6.3 dependent on dgrijalva/jwt-go v3.2.0 but gin-jwt v2.7.0 has been upgraded to golang-jwt/jwt/v4

so,we should upgrade gin-jwt version to 2.7.0 to get greater security

[breezewish]

Considering that we have some failed attempts due to compiler version in #1026, is it possible to use something like go mod replace to specify the dependency version?