Get TRAPI 1.3-beta validation working

[edeutsch]

Validation of TRAPI 1.3 Responses is currently failing, e.g.: https://arax.ncats.io/NewFmt/?r=54172

because we are validating TRAPI 1.3 messages against the TRAPI 1.2 schema Because the SRI-maintained TRAPI validator cannot validate against TRAPI 1.3-beta yet. Richard is working on that, high prio As soon as that is ready, we need to upgrade our validator package and update some ARAX code to trigger the right validation and test