[issue41490] Update bundled pip to 20.2.1 and setuptools to 49.2.1

[Jason R. Coombs]

Jason R. Coombs <jaraco at jaraco.com> added the comment:

> I haven't yet figured out whether there's a convenient way for the reader to not keep the ZIP open for as long as it exists, but I think that's going to be the safest fix.

You may be right here. I don't fully understand the repro, but it seems to me like you're trying to delete a zip file while you have resources open in that zip file. I think we need a separate issue to capture the underlying defect.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41490>
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