[issue43930] Update bundled pip to 21.1 and setuptools to 56.0.0

[Stéphane Bidoul]

Change by Stéphane Bidoul <stephane.bidoul at acsone.eu>:


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nosy: +Marcus.Smith -sbidoul

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43930>
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