allow websockets 15+ to support proxy

[DeoLeung]

Confirm this is a feature request for the Python library and not the underlying OpenAI API.

• This is a feature request for the Python library

Describe the feature or improvement you're requesting

for realtime supporting websockets 15+ so we can use proxy easily

Additional context

No response

[RobertCraigie]

This will be fixed in the next release! #2271