package/jsoncpp: bump version to 1.9.6
Release notes:
https://github.com/open-source-parsers/jsoncpp/releases/tag/1.9.6
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit d7dbcfb9826c92a9b1a73c0c842034eddd93250a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>