asynq: use py3 generator throws

[994125010]

the asyncio stuff is py3 so also do this

Reviewers: hwanseung

Test Plan: unit tests still work

Addresses Pull Requests:

Differential Revision:

Asana Tasks:

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Pull Request Overview

This PR modernizes the generator.throw() call in the convert_asynq_to_async function to use Python 3's simplified single-argument syntax instead of the legacy three-argument form.

• Simplified generator.throw() from three arguments to single argument form

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[HwanSeungYeo]

Thanks for updating this! It looks good to me.

To provide more context, this is to address the following warning messge.

DeprecationWarning: the (type, exc, tb) signature of throw() is deprecated, use the single-arg signature instead.