Use OrderDict instead of dict in sanitize_for_serialization

[MHMK2002]

In the sanitize_for_serialization function in api_client.py, the object may be of type OrderedDict, where maintaining the user-defined order is important. However, at the end of the function, the object is converted to a standard dict, causing the order to be lost.

[roycaihw]

api_client.py is generated from https://github.com/openapitools/openapi-generator. Could you file an issue in the upstream?

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