Update Skolo Win bots.

Change-Id: I45fb81be43de223f67a16471c772dd2fb9d18490
Reviewed-on: https://skia-review.googlesource.com/145265
Reviewed-by: Kevin Lubick <[email protected]>
Commit-Queue: Ben Wagner <[email protected]>

Author: dogben

infra/bots/gen_tasks.go

@@ -434,7 +434,7 @@ func defaultSwarmDimensions(parts map[string]string) []string {
 			"Ubuntu14":   DEFAULT_OS_UBUNTU,
 			"Ubuntu17":   "Ubuntu-17.04",
 			"Win":        DEFAULT_OS_WIN,
-			"Win10":      "Windows-10-17134.165",
+			"Win10":      "Windows-10-17134.191",
 			"Win2k8":     "Windows-2008ServerR2-SP1",
 			"Win2016":    DEFAULT_OS_WIN,
 			"Win7":       "Windows-7-SP1",