Update bundled pip to 21.1 and setuptools to 56.0.0

[sbidoul]

BPO	43930
Nosy	@pfmoore, @sbidoul, @ncoghlan, @dstufft, @pradyunsg
PRs	bpo-43930: Update bundled pip to 21.1 and setuptools to 56.0.0 #25576 [3.9] bpo-43930: Update bundled pip to 21.1 and setuptools to 56.0.0 #25578 [3.8] bpo-43930: Update bundled pip to 21.1 and setuptools to 56.0.0 #25579

^{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 = None
closed_at = <Date 2021-04-30.18:55:04.564>
created_at = <Date 2021-04-24.14:13:55.632>
labels = ['library', '3.10']
title = 'Update bundled pip to 21.1 and setuptools to 56.0.0'
updated_at = <Date 2021-04-30.18:55:04.563>
user = 'https://github.com/sbidoul'

bugs.python.org fields:

activity = <Date 2021-04-30.18:55:04.563>
actor = 'sbidoul'
assignee = 'none'
closed = True
closed_date = <Date 2021-04-30.18:55:04.564>
closer = 'sbidoul'
components = ['Library (Lib)']
creation = <Date 2021-04-24.14:13:55.632>
creator = 'sbidoul'
dependencies = []
files = []
hgrepos = []
issue_num = 43930
keywords = ['patch']
message_count = 4.0
messages = ['391777', '391784', '391813', '391814']
nosy_count = 6.0
nosy_names = ['paul.moore', 'sbidoul', 'ncoghlan', 'dstufft', 'pradyunsg', 'Marcus.Smith']
pr_nums = ['25576', '25578', '25579']
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue43930'
versions = ['Python 3.10']

[sbidoul]

I've just released pip 21.1, so this is to update the bundled copy (as well as updating setuptools).

[pfmoore]

New changeset 1969835 by Stéphane Bidoul in branch 'master':
bpo-43930: Update bundled pip to 21.1 and setuptools to 56.0.0 (GH-25576)
1969835

[pfmoore]

New changeset d962b00 by Stéphane Bidoul in branch '3.9':
[3.9] bpo-43930: Update bundled pip to 21.1 and setuptools to 56.0.0 (GH-25578)
d962b00

[pfmoore]

New changeset fc82f3f by Stéphane Bidoul in branch '3.8':
[3.8] bpo-43930: Update bundled pip to 21.1 and setuptools to 56.0.0 (GH-25576) (GH-25579)
fc82f3f