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

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

The issue above doesn't appear to repro on 3.9, so I guess master has started leaking a file handle, presumably in zipimport.

I'll see what I can track down, but can't be sure I'll have enough time to get it done for RC, so if anyone else wants to help out feel free.

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