package/paho-mqtt-c: security bump to version 1.3.9

Old security issue not fixed:
https://github.com/eclipse/paho.mqtt.c/issues/1084

https://github.com/eclipse/paho.mqtt.c/milestone/16?closed=1

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/paho-mqtt-c/paho-mqtt-c.hash

@@ -1,5 +1,5 @@
 # Locally computed:
-sha256  4920ff685344cdb0272568bc4414dcf48fcdfc4a98c78b1f3ca49c38417bf391  paho-mqtt-c-1.3.8.tar.gz
+sha256  386c9b5fa1cf6d0d516db12d57fd8f6a410dd0fdc5e9a2da870aae437a2535ed  paho-mqtt-c-1.3.9.tar.gz
 sha256  83bbba033dc985487e321b6dfde111772affb73460be48726299fed3da684b1c  edl-v10
 sha256  0becf16567beb77fa252b7664631dd177c8f9a1889e48995b45379c7130e5303  epl-v20
 sha256  bc0f3f447097eb82a29ad6c2f4929572bb548b6bd4c9e38fde1bf131a771b7a0  LICENSE

package/paho-mqtt-c/paho-mqtt-c.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-PAHO_MQTT_C_VERSION = 1.3.8
+PAHO_MQTT_C_VERSION = 1.3.9
 PAHO_MQTT_C_SITE = $(call github,eclipse,paho.mqtt.c,v$(PAHO_MQTT_C_VERSION))
 PAHO_MQTT_C_LICENSE = EPL-2.0 or BSD-3-Clause
 PAHO_MQTT_C_LICENSE_FILES = epl-v20 edl-v10 LICENSE