Upgrade bundled pip/setuptools

[dstufft]

BPO	35277
Nosy	@ned-deily, @serhiy-storchaka, @dstufft, @jacobtylerwalls
PRs	bpo-35277: Upgrade pip to 18.1 and setuptools to 40.6.2 #10598 [3.7] bpo-35277: Upgrade pip to 18.1 and setuptools to 40.6.2 (GH-10598) #10599 [3.6] bpo-35277: Upgrade pip to 18.1 and setuptools to 40.6.2 (GH-10598) #10600 [2.7] bpo-35277: Upgrade pip to 18.1 and setuptools to 40.6.2 (GH-10598) #10601
Superseder	bpo-36608: Replace bundled pip and setuptools with a downloader in the ensurepip module

^{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/dstufft'
closed_at = <Date 2021-07-05.23:31:23.921>
created_at = <Date 2018-11-19.12:21:44.136>
labels = ['3.8', '3.7', 'library']
title = 'Upgrade bundled pip/setuptools'
updated_at = <Date 2021-07-05.23:31:23.920>
user = 'https://github.com/dstufft'

bugs.python.org fields:

activity = <Date 2021-07-05.23:31:23.920>
actor = 'ned.deily'
assignee = 'dstufft'
closed = True
closed_date = <Date 2021-07-05.23:31:23.921>
closer = 'ned.deily'
components = ['Library (Lib)']
creation = <Date 2018-11-19.12:21:44.136>
creator = 'dstufft'
dependencies = []
files = []
hgrepos = []
issue_num = 35277
keywords = ['patch']
message_count = 5.0
messages = ['330096', '330098', '330099', '396943', '397029']
nosy_count = 4.0
nosy_names = ['ned.deily', 'serhiy.storchaka', 'dstufft', 'jacobtylerwalls']
pr_nums = ['10598', '10599', '10600', '10601']
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '36608'
type = None
url = 'https://bugs.python.org/issue35277'
versions = ['Python 2.7', 'Python 3.4', 'Python 3.5', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[dstufft]

Upgrade the bundled pip/setuptools to the latest version.

Making this issue because blurb gets mad at me if I try to add a news entry without a bpo issue.

[serhiy-storchaka]

It would be better to not add the bundle in the git repository, but add an external dependency like for Tcl/Tk on Windows. Every new release of pip+setuptools increases the size of the git repository by around 2 MiB. This will be the fourth update in 2018. There were 9 updates in 2016.

[dstufft]

It doesn't bother me if you want to make that change, I don't currently have the time to do it. I just figured I'd throw the update PRs up since I can do it quickly.

[jacobtylerwalls]

Presumably this can be closed.

[ned-deily]

Thanks for the comment. While the original intent of the issue was resolved (by updating the bundled pip), Serhiy's point about the size of the repo increasing is still an issue but there is a more recent issue, bpo-36608, with a proposed change that addresses that aspect.