[issue44516] Update bundled pip to 21.1.3

[Stéphane Bidoul]

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


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pull_requests: +25490
pull_request: https://github.com/python/cpython/pull/26917

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44516>
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