python3: upgrade 3.8.7 -> 3.8.8

Release Date: Feb. 19, 2021

Note: The release you're looking at is Python 3.8.8, a bugfix release for the
legacy 3.8 series. Python 3.9 is now the latest feature release series of
Python 3.

Notable changes in Python 3.8.8

Earlier Python versions allowed using both ; and & as query parameter
separators in urllib.parse.parse_qs() and urllib.parse.parse_qsl(). Due to
security concerns, and to conform with newer W3C recommendations, this has been
changed to allow only a single separator key, with & as the default. This
change also affects cgi.parse() and cgi.parse_multipart() as they use the
affected functions internally. For more details, please see their respective
documentation. (Contributed by Adam Goldschmidt, Senthil Kumaran and Ken Jin
in bpo-42967.)

License-Update: update copyright years

Drop patches fixed in 3.8.8:
- CVE-2021-3177

Fixes:
CVE: CVE-2021-3426
CVE: CVE-2021-23336

References:
https://www.python.org/downloads/release/python-388/
https://docs.python.org/release/3.8.8/whatsnew/changelog.html#changelog
https://docs.python.org/3/whatsnew/3.8.html#notable-changes-in-python-3-8-8
https://nvd.nist.gov/vuln/detail/CVE-2021-3177
https://nvd.nist.gov/vuln/detail/CVE-2021-3426

(From OE-Core rev: fdfc3340b58e1af0c231eedaa07358f7d9c6483e)

Signed-off-by: Tim Orling <timothy.t.orling@intel.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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