update python path to 3.9 for site-packages

Been having issues getting this to build on Ubuntu 20 and this change
got it working. I don't remember the details on why we need this but we
are now installing python3.9 in our CI images so make it match.

Change-Id: Ic72d32a612d186359b78d098697477db9132c8ad
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
1 file changed