Update to WinAppSdk 1.6.240531000-experimental1

Author: Arlodotexe

MultiTarget/PackageReferences/WinAppSdk.props

@@ -1,6 +1,9 @@
 <Project>
   <ItemGroup>
-    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.5.240311000" />
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.6.240531000-experimental1" />
     <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.756" />
   </ItemGroup>
+  <ItemGroup Condition="'$(Configuration)' == 'Release'">
+    <PackageReference Include="Microsoft.Windows.CsWinRT" Version="2.1.0-prerelease.240602.1" />
+  </ItemGroup>
 </Project>