[issue39349] Add "cancel_futures" parameter to concurrent.futures.Executor.shutdown()

[Shantanu]

Change by Shantanu <hauntsaninja at gmail.com>:


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pull_requests: +21145
pull_request: https://github.com/python/cpython/pull/22048

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39349>
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