* chore(deps): Update grpc-gateway dependency
This fixes an issue which would allow an attacker to trigger a
(recovered) panic in the gateway handler.
* fix(server): Use cmp.Diff instead of assert.Equal
Testify is not great at handling protobuf types, and
was for some reason returning a diff here when in
reality there is none. Switch to go-cmp for the
comparison to remove the error.