[Deps]Upgrade WpfUI to preview.9 and fix Windows 10 background issue (#29884)

* Bumping to preview9

src/common/Common.UI/OSVersionHelper.cs

@@ -0,0 +1,16 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+
+namespace Common.UI
+{
+    public static class OSVersionHelper
+    {
+        public static bool IsWindows11()
+        {
+            return Environment.OSVersion.Version.Major >= 10 && Environment.OSVersion.Version.Build >= 22000;
+        }
+    }
+}