python3: upgrade 3.8.11 -> 3.8.12

Release Date: Aug. 30, 2021

This is a security release of Python 3.8

Note: The release you're looking at is Python 3.8.12, a security bugfix release
for the legacy 3.8 series. Python 3.10 is now the latest feature release series
of Python 3. Get the latest release of 3.10.x here.

Security content in this release contains four fixes. There are also four
additional fixes for bugs that might have lead to denial-of-service attacks.
Finally, while we're not providing binary installers anymore, for those users
who produce installers, we upgraded the OpenSSL version used to 1.1.1l.
Take a look at the change log for details.

According to the release calendar specified in PEP 569, Python 3.8 is now in the
"security fixes only" stage of its life cycle: 3.8 branch only accepts security
fixes and releases of those are made irregularly in source-only form until
October 2024. Python 3.8 isn't receiving regular bug fixes anymore, and binary
installers are no longer provided for it. Python 3.8.10 was the last full bugfix
release of Python 3.8 with binary installers.

This release includes a fix for CVE-2021-29921.

References:
https://docs.python.org/release/3.8.12/whatsnew/changelog.html#changelog



Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>