Simplify xmlrpc Marshallers
Since the switch to Python3, we can simplify special Python2 case from the XML-RPC marshallers.
This instance will be upgraded to Heptapod 1.3.1 (GitLab 16.9.3) on 2023-03-28 at 17:00 UTC+1
Since the switch to Python3, we can simplify special Python2 case from the XML-RPC marshallers.