Update FreeRTOS+TCP submodule pointer (#427)

Updates the FreeRTOS+TCP submodule pointer.
This brings in a fix that needs changes in defender demo.

FreeRTOS-Plus/Demo/AWS/Device_Defender_Windows_Simulator/Device_Defender_Demo/metrics_collector.c

@@ -82,13 +82,13 @@ eMetricsCollectorStatus eGetNetworkStats( NetworkStats_t * pxOutNetworkStats )
                     "bytes sent: %u, packets sent: %u.",
                     ( unsigned int ) xMetrics.xInput.uxByteCount,
                     ( unsigned int ) xMetrics.xInput.uxPacketCount,
-                    ( unsigned int ) xMetrics.XOutput.uxByteCount,
-                    ( unsigned int ) xMetrics.XOutput.uxPacketCount ) );
+                    ( unsigned int ) xMetrics.xOutput.uxByteCount,
+                    ( unsigned int ) xMetrics.xOutput.uxPacketCount ) );
 
         pxOutNetworkStats->ulBytesReceived = xMetrics.xInput.uxByteCount;
         pxOutNetworkStats->ulPacketsReceived = xMetrics.xInput.uxPacketCount;
-        pxOutNetworkStats->ulBytesSent = xMetrics.XOutput.uxByteCount;
-        pxOutNetworkStats->ulPacketsSent = xMetrics.XOutput.uxPacketCount;
+        pxOutNetworkStats->ulBytesSent = xMetrics.xOutput.uxByteCount;
+        pxOutNetworkStats->ulPacketsSent = xMetrics.xOutput.uxPacketCount;
     }
 
     return eStatus;

FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP

@@ -1 +1 @@
-Subproject commit 21d3a247ff09445d10f6e6745f8dc055c46c29af
+Subproject commit 645673bff9c158efab1ee18e0d5861f304514733