[infra] Update Win OS version

No-Tree-Checks: true
No-Presubmit: true
Change-Id: Ia542edfd8f1e0325d6f8f8f43ac52a421b7a56ca
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213138
Reviewed-by: Ben Wagner aka dogben <benjaminwagner@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
2 files changed