Bump WPF-UI package version (#30411)

* Bump WPF-UI package version

* Update notice.md

Author: stefansjfw

Directory.Packages.props

@@ -74,7 +74,7 @@
     <PackageVersion Include="Vanara.PInvoke.User32" Version="3.4.11" />
     <PackageVersion Include="Vanara.PInvoke.Shell32" Version="3.4.11" />
     <PackageVersion Include="WinUIEx" Version="2.2.0" />
-    <PackageVersion Include="WPF-UI" Version="3.0.0-preview.11" />
+    <PackageVersion Include="WPF-UI" Version="3.0.0-preview.12" />
   </ItemGroup>
   <ItemGroup Condition="'$(IsExperimentationLive)'!=''">
     <!-- Additional dependencies used by experimentation -->

NOTICE.md

@@ -1331,5 +1331,5 @@ EXHIBIT A -Mozilla Public License.
 - Vanara.PInvoke.Shell32 3.4.11
 - Vanara.PInvoke.User32 3.4.11
 - WinUIEx 2.2.0
-- WPF-UI 3.0.0-preview.11
+- WPF-UI 3.0.0-preview.12