mosquitto: security bump to version 1.4.8

This includes a fix for a security related bug related to the listener
mount_point feature.  The bug allows a client that is restricted to a
mount_point to publish messages outside this hierarchy using the last will
and testament feature.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mosquitto/mosquitto.hash

@@ -1,2 +1,2 @@
 # Locally calculated after checking pgp signature
-sha256  71a1cb37893403e00b7db85c5db4af50b40d055ce61e5d21092c2594f2023b8b  mosquitto-1.4.7.tar.gz
+sha256  d96eb5610e57cc3e273f4527d3f54358ab7711459941a9e64bc4d0a85c2acfda  mosquitto-1.4.8.tar.gz

package/mosquitto/mosquitto.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MOSQUITTO_VERSION = 1.4.7
+MOSQUITTO_VERSION = 1.4.8
 MOSQUITTO_SITE = http://mosquitto.org/files/source
 MOSQUITTO_LICENSE = EPLv1.0 or EDLv1.0
 MOSQUITTO_LICENSE_FILES = LICENSE.txt epl-v10 edl-v10