test/py: Bump py to 1.10.0 for CVE-2020-29651

Bump our py version to 1.10.0 to address CVE-2020-29651.

Reported-by: GitHub dependabot
Reported-by: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Tom Rini <trini@konsulko.com>