Different model for get_locked_product_position for different API keys

# Issue
Running the query with same configuration and code but two different api key result in different output for res_flex.data()
One is dict the other is a binance defined model

```
configuration = ConfigurationRestAPI(api_key=api_key, api_secret=api_secret)
clientSimpleEarn = SimpleEarn(config_rest_api=configuration)

res_flex = clientSimpleEarn.rest_api.get_flexible_product_position(
recv_window=59999
)
```

# Expected result
Independant response model from the API keys used

# Env
requires-python = "==3.12.11"
dependencies = [
"binance-sdk-simple-earn>=3.2.0"
]