Update MSVC toolchain asset to 2019

This leaves the Win SDK at 10.0.17763.0 (I got errors when trying to
move to something newer).

It moves from VS 2017 to VS 2019 (14.16.27023), which fixes an internal
compiler error in recent ANGLE. We're also generally overdue for
switching to 2019, which has been released and stable for quite a while.

Docs-Preview: https://skia.org/?cl=261542
Change-Id: Iba15d52f558e92407866315681c2e99711c6d26a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/261542
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
3 files changed