package/samba4: bump version to 4.19.6
Release notes: https://www.samba.org/samba/history/samba-4.19.6.html
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit e19eb8c29c47e9a54416c1ab41d0d87fba074577)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>