esp_mqtt: add option to configure mqtt task priority.

Merges https://github.com/espressif/esp-idf/pull/4947

components/mqtt/Kconfig

@@ -86,6 +86,13 @@ menu "ESP-MQTT Configurations"
             Default config employs API locks to protect internal structures. It is possible to disable
             these locks if the user code doesn't access MQTT API from multiple concurrent tasks
 
+    config MQTT_TASK_PRIORITY
+        int "MQTT task priority"
+        default 5
+        depends on MQTT_USE_CUSTOM_CONFIG
+        help
+            MQTT task priority. Higher number denotes higher priority.
+
     config MQTT_TASK_CORE_SELECTION_ENABLED
         bool "Enable MQTT task core selection"
         default false

components/mqtt/esp-mqtt

@@ -1 +1 @@
-Subproject commit 86fc8b7584f7f3aebf422843d84a26655e485fbe
+Subproject commit d8e20813326cb6c9fe0303fc5ba1813ccca53065