[serve][python3.11] Use tasks/futures for asyncio.wait

[zcin]

Signed-off-by: Cindy Zhang [email protected]

Why are these changes needed?

In Python 3.11, coroutines are no longer allowed in asyncio.wait. Need to pass in a task instead.

Related issue number

#31360

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• I've included any doc changes needed for https://docs.ray.io/en/master/.
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• Testing Strategy
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[edoakes]

Is there any behavior difference here?

[zcin]

Is there any behavior difference here?

I don't think so. According to the docs:
"If any awaitable in aws is a coroutine, it is automatically scheduled as a Task."

So from my understanding, instead of the coroutine setup_complete.wait() being scheduled for us, we are just manually scheduling it as a task before passing it to asyncio.wait.