Remove use of GEANT4_TAG in Main.py and Prerelease.py
The following discussion from !1115 (merged) should be addressed:
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@gcorti started a discussion: (+1 comment)
DEFAULT_GEANT4_VERSION = 'v10r6p2t7'
Can change it only after the deployment of v10r7p3t0, but also need to change Main.py as GEANT4_TAG is not used from Geant4 10 onward