[issue32262] Fix linting errors in asyncio code; use f-strings consistently

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

I think it's OK. I want asyncio code to stay modern and up to date.  git blame is not a problem here, as only one-two lines are changed per function. Code consistency is more important.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32262>
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