package/python3: security bump to version 3.9.2

package/python3: security bump to version 3.9.2

Fixes the following security issue:

- CVE-2021-23336: urllib.parse.parse_qsl(): Web cache poisoning - `; ` as a
  query args separator
  https://bugs.python.org/issue42967

And fixes a number of issues. For details, see the changelog:
https://docs.python.org/release/3.9.2/whatsnew/changelog.html

Drop the now upstreamed security patch and update the license hash for a
change of copyright year:

-2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Python Software Foundation;
+2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Python Software Foundation;

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>