Update WASDK 1.6.241114003 and CsWinRT 2.1.6 to fix issues with StaggeredLayout in WinUI 3

We were hitting issues with ItemSource setting in WinUI 3, per similar notes in CommunityToolkit/Windows#516
Updating CsWin32 provided better error messages (mostly to do with using {Binding} still in samples), but this appears to resolve the ItemsSource issue I was seeing before

Author: michael-hawker

MultiTarget/PackageReferences/WinAppSdk.props

@@ -1,6 +1,7 @@
 <Project>
   <ItemGroup>
-    <PackageReference Condition="'$(HasWinUI)' == 'true'" Include="Microsoft.WindowsAppSDK" Version="1.6.240923002" />
+    <PackageReference Condition="'$(HasWinUI)' == 'true'" Include="Microsoft.WindowsAppSDK" Version="1.6.241114003" />
+    <PackageReference Condition="'$(HasWinUI)' == 'true'" Include="Microsoft.Windows.CsWinRt" Version="2.1.6" PrivateAssets="all" />
     <PackageReference Condition="'$(HasWinUI)' == 'true'" Include="Microsoft.Web.WebView2" Version="1.0.2792.45" PrivateAssets="all" />
   </ItemGroup>
 </Project>