Update to esp-ml307@3.1.1

main/boards/common/esp32_camera.cc

@@ -210,7 +210,7 @@ std::string Esp32Camera::Explain(const std::string& question) {
     });
 
     auto network = Board::GetInstance().GetNetwork();
-    auto http = std::unique_ptr<Http>(network->CreateHttp(3));
+    auto http = network->CreateHttp(3);
     // 构造multipart/form-data请求体
     std::string boundary = "----ESP32_CAMERA_BOUNDARY";