Update bundled pip to 21.0.1 and setuptools to 52.0.0

[pfmoore]

BPO	43077
Nosy	@pfmoore, @ncoghlan, @dstufft, @pradyunsg, @jacobtylerwalls
PRs	bpo-43077: Update bundled pip to 21.0.1 and setuptools to 52.0.0 #24386 [3.9] bpo-43077: Update bundled pip to 21.0.1 and setuptools to 52.0.0 (GH-24386) #24387 [3.8] bpo-43077: Update bundled pip to 21.0.1 and setuptools to 52.0.0 (GH-24386) #24388

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/pfmoore'
closed_at = <Date 2021-07-04.17:58:50.954>
created_at = <Date 2021-01-30.15:18:41.601>
labels = ['3.8', 'type-bug', 'library', '3.9', '3.10']
title = 'Update bundled pip to 21.0.1 and setuptools to 52.0.0'
updated_at = <Date 2021-07-04.17:58:50.953>
user = 'https://github.com/pfmoore'

bugs.python.org fields:

activity = <Date 2021-07-04.17:58:50.953>
actor = 'paul.moore'
assignee = 'paul.moore'
closed = True
closed_date = <Date 2021-07-04.17:58:50.954>
closer = 'paul.moore'
components = ['Library (Lib)']
creation = <Date 2021-01-30.15:18:41.601>
creator = 'paul.moore'
dependencies = []
files = []
hgrepos = []
issue_num = 43077
keywords = ['patch']
message_count = 3.0
messages = ['385986', '385988', '396942']
nosy_count = 6.0
nosy_names = ['paul.moore', 'ncoghlan', 'dstufft', 'pradyunsg', 'Marcus.Smith', 'jacobtylerwalls']
pr_nums = ['24386', '24387', '24388']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43077'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[pfmoore]

I've just released pip 21.0.1, so this updates the bundled copy (as well as updating setuptools).

I assume this should be backported to 3.8 and 3.9.

[pfmoore]

New changeset 4d11ecb by Paul Moore in branch 'master':
bpo-43077: Update bundled pip to 21.0.1 and setuptools to 52.0.0 (GH-24386)
4d11ecb

[jacobtylerwalls]

Presumably this can be closed.