dep: Update dependency Microsoft.WindowsAppSDK to v1.4.231219000

NatTypeTester.WinUI/NatTypeTester.WinUI.csproj

@@ -21,7 +21,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" />
-    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.4.231115000" />
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.4.231219000" />
     <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.2428" />
     <PackageReference Include="ReactiveMarbles.ObservableEvents.SourceGenerator" Version="1.3.1" PrivateAssets="all" />
     <PackageReference Include="ReactiveUI.WinUI" Version="19.5.39" />