Add DestroyPythonObjects call into destructor

Author: aleksn7

src/pb_stub.cc

@@ -1059,15 +1059,7 @@ Stub::~Stub()
   }
 #endif
 
-  // Ensure the interpreter is active before trying to clean up.
-  if (Py_IsInitialized()) {
-    py::gil_scoped_acquire acquire;
-    py::object async_event_loop_local(std::move(async_event_loop_));
-    py::object background_futures_local(std::move(background_futures_));
-    py::object model_instance_local(std::move(model_instance_));
-    py::object deserialize_bytes_local(std::move(deserialize_bytes_));
-    py::object serialize_bytes_local(std::move(serialize_bytes_));
-  }
+  DestroyPythonObjects();
 
   stub_message_queue_.reset();
   parent_message_queue_.reset();