Update Windows image patch version

Update Windows image version to the latest one. This one includes a fix
for unix domain socket

Author: jingxu97

cluster/gce/util.sh

@@ -88,11 +88,11 @@ function set-linux-node-image() {
 function set-windows-node-image() {
   WINDOWS_NODE_IMAGE_PROJECT="windows-cloud"
   if [[ "${WINDOWS_NODE_OS_DISTRIBUTION}" == "win2019" ]]; then
-    WINDOWS_NODE_IMAGE="windows-server-2019-dc-core-for-containers-v20200310"
+    WINDOWS_NODE_IMAGE="windows-server-2019-dc-core-for-containers-v20200908"
   elif [[ "${WINDOWS_NODE_OS_DISTRIBUTION}" == "win1909" ]]; then
-    WINDOWS_NODE_IMAGE="windows-server-1909-dc-core-for-containers-v20200310"
+    WINDOWS_NODE_IMAGE="windows-server-1909-dc-core-for-containers-v20200908"
   elif [[ "${WINDOWS_NODE_OS_DISTRIBUTION}" == "win1809" ]]; then
-    WINDOWS_NODE_IMAGE="windows-server-1809-dc-core-for-containers-v20200310"
+    WINDOWS_NODE_IMAGE="windows-server-1809-dc-core-for-containers-v20200908"
   else
     echo "Unknown WINDOWS_NODE_OS_DISTRIBUTION ${WINDOWS_NODE_OS_DISTRIBUTION}" >&2
     exit 1