[issue39789] Update Windows release build machines to latest versions

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

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.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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