modem-manager: bump to version 1.6.8

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/modem-manager/modem-manager.hash

@@ -1,2 +1,2 @@
 # Locally computed
-sha256  cdd5b4cb1e4d7643643a28ccbfc4bb354bfa9cb89a77ea160ebdf7926171c668  ModemManager-1.6.4.tar.xz
+sha256  ffc035c4bfeb07780c4580bb4488ade0ab1d197c3cdf89cb8ab36386cfb34376  ModemManager-1.6.8.tar.xz

package/modem-manager/modem-manager.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MODEM_MANAGER_VERSION = 1.6.4
+MODEM_MANAGER_VERSION = 1.6.8
 MODEM_MANAGER_SOURCE = ModemManager-$(MODEM_MANAGER_VERSION).tar.xz
 MODEM_MANAGER_SITE = http://www.freedesktop.org/software/ModemManager
 MODEM_MANAGER_LICENSE = GPL-2.0+ (programs, plugins), LGPL-2.0+ (libmm-glib)