python3: fix CVE-2020-8492

CVE: CVE-2020-8492

(From OE-Core rev: c9ee462b)

Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 5811ed9140fab64da59d0d2ad6e6b0fec8341a20)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>