Update bundled pip to 20.1.1

[xavfernandez]

BPO	38488
Nosy	@vstinner, @ned-deily, @The-Compiler, @miss-islington, @xavfernandez
PRs	bpo-38488: Upgrade bundled versions of pip & setuptools #16782 Revert "bpo-38488: Upgrade bundled versions of pip & setuptools" #20484 bpo-38488: Upgrade bundled versions of pip & setuptools #20491 [3.9] bpo-38488: Upgrade bundled versions of pip & setuptools (GH-20491) #20898 [3.8] bpo-38488: Upgrade bundled versions of pip & setuptools (GH-20491) #20900 [3.7] bpo-38488: Upgrade bundled versions of pip & setuptools (GH-20491) (GH-20900) #20902

^{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 2020-06-15.23:05:58.964>
created_at = <Date 2019-10-15.21:19:42.779>
labels = ['3.7', '3.8', '3.9', '3.10', 'type-feature', 'library']
title = 'Update bundled pip to 20.1.1'
updated_at = <Date 2020-06-15.23:05:58.955>
user = 'https://github.com/xavfernandez'

bugs.python.org fields:

activity = <Date 2020-06-15.23:05:58.955>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2020-06-15.23:05:58.964>
closer = 'ned.deily'
components = ['Library (Lib)']
creation = <Date 2019-10-15.21:19:42.779>
creator = 'Xavier Fernandez'
dependencies = []
files = []
hgrepos = []
issue_num = 38488
keywords = ['patch']
message_count = 9.0
messages = ['370204', '370210', '370211', '370213', '371587', '371596', '371598', '371599', '371603']
nosy_count = 5.0
nosy_names = ['vstinner', 'ned.deily', 'The Compiler', 'miss-islington', 'Xavier Fernandez']
pr_nums = ['16782', '20484', '20491', '20898', '20900', '20902']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue38488'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

[vstinner]

Various buildbots which run the tests with an installed python, fail with: (...)

It's the "chmod" step which fails. I guess that only "Install" buildbot workers are affected. I failed to reproduce the issue with commands:
---
./configure --prefix $PWD/target --with-pydebug
make && make install
chmod -R -w target/
---

I get these permissions:
---

$ ls -l target/lib/python3.10/site-packages/setuptools-46.1.3.dist-info/RECORD
-r--r--r--. 1 vstinner vstinner 14560 28 mai   03:40 target/lib/python3.10/site-packages/setuptools-46.1.3.dist-info/RECORD

---

[vstinner]

commit feb0846
Author: Xavier Fernandez <xav.fernandez@gmail.com>
Date: Wed May 27 12:49:34 2020 +0200

Upgrade bundled versions of pip & setuptools (bpo-16782)

[vstinner]

This commit introduced another regression, bpo-40808: test_venv fails with HOME=/ on AMD64 FreeBSD Non-Debug 3.x.

[vstinner]

The change broke multiple buildbots. Since nobody is available to investigate the two regressions (install buildbots and test_venv), I reverted the change following this policy:
https://pythondev.readthedocs.io/ci.html#revert-on-fail

Buildbot failures were reported directly the on PR, see:
#16782 (comment)

The revert is an opportunity to have more time to investigate the issue and write a proper fix, rather than working on urgency.

commit 4fd4963 (HEAD -> master, upstream/master)
Author: Victor Stinner <vstinner@python.org>
Date: Thu May 28 15:57:49 2020 +0200

Revert "Upgrade bundled versions of pip & setuptools (bpo-16782)" (GH-20484)

This reverts commit feb0846c3a28b05b4cfbc6ab34c764957f3eff55.

[ned-deily]

New changeset 5f79f46 by Xavier Fernandez in branch 'master':
bpo-38488: Upgrade bundled versions of pip & setuptools (GH-20491)
5f79f46

[miss-islington]

New changeset bc996c6 by Miss Islington (bot) in branch '3.9':
bpo-38488: Upgrade bundled versions of pip & setuptools (GH-20491)
bc996c6

[ned-deily]

New changeset e63cc2f by Ned Deily in branch '3.8':
bpo-38488: Upgrade bundled versions of pip & setuptools (GH-20491) (GH-20900)
e63cc2f

[miss-islington]

New changeset 678ffc4 by Miss Islington (bot) in branch '3.7':
bpo-38488: Upgrade bundled versions of pip & setuptools (GH-20491) (GH-20900)
678ffc4

[ned-deily]

Thanks, Xavier, for the original PR and for the various requested updates! And thanks everyone else for the reviews and follow-ups. Merged for release in 3.9.0, 3.8.4, and 3.7.8.