update mqtt weekend test to use mbedtls asymetric buffer

examples/protocols/mqtt/publish_test/sdkconfig.ci

@@ -3,3 +3,6 @@ CONFIG_EXAMPLE_BROKER_TCP_URI="mqtt://${EXAMPLE_MQTT_BROKER_TCP}"
 CONFIG_EXAMPLE_BROKER_WS_URI="ws://${EXAMPLE_MQTT_BROKER_WS}/ws"
 CONFIG_EXAMPLE_BROKER_WSS_URI="wss://${EXAMPLE_MQTT_BROKER_WSS}/ws"
 CONFIG_EXAMPLE_BROKER_CERTIFICATE_OVERRIDE="${EXAMPLE_MQTT_BROKER_CERTIFICATE}"
+CONFIG_MBEDTLS_ASYMMETRIC_CONTENT_LEN=y
+CONFIG_MBEDTLS_SSL_IN_CONTENT_LEN=16384
+CONFIG_MBEDTLS_SSL_OUT_CONTENT_LEN=16384