Support of Python 3.10

Adds a patch to pyangbind to continue to work with updated
packages

Change-Id: I0b33375ddbb96734ae72669baaef744bf2152bb1
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>