python3: upgrade 3.8.5 -> 3.8.6

python3: upgrade 3.8.5 -> 3.8.6

Release Date: Sept. 24, 2020

Note: The release you're looking at is Python 3.8.6, a bugfix release for the
legacy 3.8 series. Python 3.9 is now the latest feature release series of
Python 3.

References:
https://www.python.org/downloads/release/python-386/
https://docs.python.org/release/3.8.6/whatsnew/changelog.html#changelog

License-Update: PSFv2 -> PSF-2.0 and BSD-0-Clause

Starting with Python 3.8.6, examples, recipes, and other code in
the documentation are dual licensed under the PSF License Version 2
and the Zero-Clause BSD license.

Signed-off-by: Tim Orling <timothy.t.orling@intel.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>