move to github.com/golang-jwt/jwt/v4

[freeznet]

#524 resolves the jwt vulnerability by update the dependency to github.com/form3tech-oss/jwt-go v3.2.3+incompatible, but github.com/form3tech-oss/jwt-go is no longer maintain and suggested move to github.com/golang-jwt/jwt.

[wolfstudy]

@freeznet Please check action CI, thanks

[wolfstudy]

# github.com/golang-jwt/jwt/v4
Error: ../../../go/pkg/mod/github.com/golang-jwt/jwt/[email protected]/ecdsa.go:135:4: r.FillBytes undefined (type *big.Int has no field or method FillBytes)
Error: ../../../go/pkg/mod/github.com/golang-jwt/jwt/[email protected]/ecdsa.go:136:4: s.FillBytes undefined (type *big.Int has no field or method FillBytes)

[freeznet]

@wolfstudy I might close this PR first, since it turns that the latest golang-jwt/jwt/v4 requires at least go 1.15 since the FillBytes is added from 1.15 (ref: https://pkg.go.dev/math/big#Int.FillBytes)