(split out from #30551)

sage-bootstrap-python which has much wider range of supported python versions, including Python >= 2.6 and Python >= 3.4 - according to build/tox.ini.

CC: @jhpalmieri @tobiasdiez @dimpase

Component: documentation

Author: Tobias Diez, Matthias Koeppe

Branch: 4265656

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/31192