[issue42413] Replace custom exceptions for timeouts with TimeoutError

[Andrew Svetlov]

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


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pull_requests: +22404
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/23520

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42413>
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