[issue42413] Replace custom exceptions for timeouts with TimeoutError

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

Pull Request https://github.com/python/cpython/pull/23520/ applies the discussed change to both asyncio and concurrent.futures.

I did the minimally invasive change, libraries still use `asyncio.TimeoutError` and `concurrent.futures.TimeoutError` internally but both names are aliases now.

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