jsoncpp: bump to version 1.8.3

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/jsoncpp/jsoncpp.hash

@@ -1,2 +1,2 @@
 # Locally computed
-sha256 858db2faf348f89fdf1062bd3e79256772e897e7f17df73e0624edf004f2f9ac  jsoncpp-1.8.1.tar.gz
+sha256  3671ba6051e0f30849942cc66d1798fdf0362d089343a83f704c09ee7156604f  jsoncpp-1.8.3.tar.gz

package/jsoncpp/jsoncpp.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-JSONCPP_VERSION = 1.8.1
+JSONCPP_VERSION = 1.8.3
 JSONCPP_SITE = $(call github,open-source-parsers,jsoncpp,$(JSONCPP_VERSION))
 JSONCPP_LICENSE = Public Domain or MIT
 JSONCPP_LICENSE_FILES = LICENSE