CI: fix connection failures in asio example tests

* Original commit: espressif/esp-idf@b3b71bc8ab

examples/protocols/asio/chat_server/main/chat_server.cpp

@@ -225,5 +225,7 @@ extern "C" void app_main(void)
       servers.emplace_back(io_context, endpoint);
     }
 
+    std::cout << "ASIO engine is up and running" << std::endl;
+
     io_context.run();
 }