[infra] Upgrade Win to 2019

Change-Id: I7994b1e67f433b61159bd4107bee8cd86e6eb68f
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/261980
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Ravi Mistry <rmistry@google.com>
1 file changed