aws-c-mqtt: upgrade 0.13.3 -> 0.13.4

(cherry picked from commit 5886fb7)

Author: aws-iot-embedded-linux-ci

…ipes-sdk/aws-c-mqtt/aws-c-mqtt_0.13.3.bb …ipes-sdk/aws-c-mqtt/aws-c-mqtt_0.13.4.bbrecipes-sdk/aws-c-mqtt/aws-c-mqtt_0.13.3.bb renamed to recipes-sdk/aws-c-mqtt/aws-c-mqtt_0.13.4.bb recipes-sdk/aws-c-mqtt/aws-c-mqtt_0.13.3.bb renamed to recipes-sdk/aws-c-mqtt/aws-c-mqtt_0.13.4.bb

@@ -23,7 +23,7 @@ SRC_URI = "\
     file://run-ptest \
     "
 
-SRCREV = "1d512d92709f60b74e2cafa018e69a2e647f28e9"
+SRCREV = "5bf71d3026289c96f1912aa41239d00d740e13e7"
 
 S = "${WORKDIR}/git"