Update the jwt module to a supported version

[yenchenLiu]

👏 解決掉的 issue / Resolved Issues

• close #102

⛏ 變更內容 / Details of Changes

• Update import jwt to the new version
• Run go get github.com/golang-jwt/jwt && go mod tidy

I also make sure it still can pass route_users_test.go which using jwt to validate user