[issue38107] Replace direct future and task contructor calls with factories in asyncio tests

[Andrew Svetlov]

Change by Andrew Svetlov <andrew.svetlov at gmail.com>:


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keywords: +patch
pull_requests: +15568
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15928

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38107>
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