use python 3 in cyclus-deps
use python 3 in cyclus-deps

mbmcgarry/cyclus,Baaaaam/cyclus,mbmcgarry/cyclus,mbmcgarry/cyclus,gidden/cyclus,hodger/cyclus,Baaaaam/cyclus,mbmcgarry/cyclus,gidden/cyclus,gidden/cyclus,hodger/cyclus,rwcarlsen/cyclus,hodger/cyclus,Baaaaam/cyclus,gidden/cyclus,hodger/cyclus,hodger/cyclus,rwcarlsen/cyclus,rwcarlsen/cyclus,rwcarlsen/cyclus