Update Windows release build machines to latest versions

[zooba]

BPO	39789
Nosy	@pfmoore, @tjguk, @zware, @zooba, @miss-islington
PRs	bpo-39789: Update Windows release build machines to latest versions #18695 [3.8] bpo-39789: Update Windows release build machines to VS 2019 (GH-18695) #18697

^{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/zooba'
closed_at = <Date 2020-02-29.00:25:25.122>
created_at = <Date 2020-02-28.22:44:47.674>
labels = ['3.8', '3.9', 'OS-windows']
title = 'Update Windows release build machines to latest versions'
updated_at = <Date 2020-02-29.00:41:06.952>
user = 'https://github.com/zooba'

bugs.python.org fields:

activity = <Date 2020-02-29.00:41:06.952>
actor = 'miss-islington'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2020-02-29.00:25:25.122>
closer = 'steve.dower'
components = ['Windows']
creation = <Date 2020-02-28.22:44:47.674>
creator = 'steve.dower'
dependencies = []
files = []
hgrepos = []
issue_num = 39789
keywords = ['patch']
message_count = 4.0
messages = ['362931', '362947', '362948', '362951']
nosy_count = 5.0
nosy_names = ['paul.moore', 'tim.golden', 'zach.ware', 'steve.dower', 'miss-islington']
pr_nums = ['18695', '18697']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39789'
versions = ['Python 3.8', 'Python 3.9']

[zooba]

Shouldn't have any impact at all, but I'm going to mention it here so it gets in the NEWS file. Just in case someone hits an obscure edge case and is trying to find out what changed.

[zooba]

New changeset 03153dd by Steve Dower in branch 'master':
bpo-39789: Update Windows release build machines to VS 2019 (GH-18695)
03153dd

[zooba]

The backport to 3.8 doesn't matter so much for the build definition (the build always runs from master, even when targeting earlier versions), but the minor Nuget fixes are necessary, so may as well keep it all in sync.

I expect the backport to automerge, so closing.

[miss-islington]

New changeset 45c4112 by Miss Islington (bot) in branch '3.8':
bpo-39789: Update Windows release build machines to VS 2019 (GH-18695)
45c4112