Remove references to different python versions am: 5f348a40d3 am: 4c4211c9ed

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/3467869

Change-Id: If32de599295564d986cece37be5aa809cebd3718
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>