Fix 2 race conditions detected with TSan, one in CobraMetricsPublisher::push and another one in WebSocketTransport::sendData (that one was bad).

ixwebsocket/IXWebSocketTransport.cpp

@@ -867,7 +867,10 @@ namespace ix
             message_end = compressedMessage.end();
         }
 
-        _txbuf.reserve(wireSize);
+        {
+            std::lock_guard<std::mutex> lock(_socketMutex);
+            _txbuf.reserve(wireSize);
+        }
 
         // Common case for most message. No fragmentation required.
         if (wireSize < kChunkSize)

ixwebsocket/IXWebSocketVersion.h

@@ -6,4 +6,4 @@
 
 #pragma once
 
-#define IX_WEBSOCKET_VERSION "6.2.5"
+#define IX_WEBSOCKET_VERSION "6.2.6"