use python3 for package/deployment
use python3 for package/deployment

without this change the deploy fails given changes to pypi and the removal of deprecated apis CTR

apache/incubator-tinkerpop,jorgebay/tinkerpop,robertdale/tinkerpop,jorgebay/tinkerpop,krlohnes/tinkerpop,pluradj/incubator-tinkerpop,artem-aliev/tinkerpop,apache/tinkerpop,krlohnes/tinkerpop,apache/tinkerpop,jorgebay/tinkerpop,apache/tinkerpop,apache/incubator-tinkerpop,krlohnes/tinkerpop,jorgebay/tinkerpop,artem-aliev/tinkerpop,robertdale/tinkerpop,apache/tinkerpop,robertdale/tinkerpop,pluradj/incubator-tinkerpop,apache/tinkerpop,apache/tinkerpop,artem-aliev/tinkerpop,pluradj/incubator-tinkerpop,krlohnes/tinkerpop,artem-aliev/tinkerpop,apache/incubator-tinkerpop,krlohnes/tinkerpop,apache/tinkerpop,robertdale/tinkerpop,robertdale/tinkerpop,artem-aliev/tinkerpop