As there are some improvements for buffer serialization in pickle
protocol 5 and these can be opted in using a backports package on older
Python versions. Try to leverage the backport package when available and
fallback to the builtin pickle otherwise.

This is a backport of Python's pickle 5 protocol for Python 3.6 and 3.7.
So install it for those versions. In Python 3.8+ this is included in
Python natively. So skip installing it for more recent Python versions.