Fix Open AI await response

[frankong]

Getting
TypeError: object tuple can't be used in 'await' expression when using AsyncOpenAI with streaming responses.

The error is from the await self._client._ph_client.capture( line because capture is not an asynchronous function.

Removing the await fixes this

[greptile-apps]

PR Summary

Fixes the TypeError by removing an unnecessary await on the synchronous capture call in WrappedResponses within posthog/ai/openai/openai_async.py, though a similar issue remains in WrappedCompletions.

• Removed await from capture in /posthog/ai/openai/openai_async.py’s WrappedResponses._capture_streaming_event.
• Noted that await is still used in WrappedCompletions._capture_streaming_event, which may trigger similar errors.
• Suggest verifying consistency and testing streaming completions again.

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