Previously the docker utilized Python-Pip. This is an intermediate dependency we don't need. We can install the Python-six module directly via the APT framework. Change-Id: I30e3e1cdca802ca19422140f39af7dc9dc166ed7 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/28891 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>