Obsolete Newtonsoft APIs
We should consider obsoleting public APIs returning Newtonsoft types.
Specifically the HttpRepository.Query method returns a JObject from newtonsoft: https://gitlab.com/OpenTAP/opentap/-/blob/master/Package/Repositories/HttpPackageRepository.cs#L670
I have not investigated if we return third party library types from other APIs, but this is generally a bad idea.