Use one JWT library

Keeping with Minimize Dependencies , we exclusively use github.com/lestrrat-go/jwx/v3 for all JWT operations. Pros This library is focused, mature, and well-maintained. This library appears to have the capabilities that we need. Cons This can require additional work to refactor code to use preferred dependencies. Support for secp256k1 currently requires a build flag . New key types might not be supported.