[issue43993] Update bundled pip to 21.1.1

[Stéphane Bidoul]

New submission from Stéphane Bidoul <stephane.bidoul at acsone.eu>:

This is to update the bundled pip to 21.1.1.

Compared to 21.1, it includes a fix that suppresses a noisy message when distutils and sysconfig schemes do not match. 

I link this issue to 3.9 and 3.8 as well, as it could be nice to include it in the release for a better user experience, if we are not too close to the release deadline.

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title: Upda -> Update bundled pip to 21.1.1
versions: +Python 3.10, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43993>
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