Bump CsWinRT and WindowsSdkPackageVersion to latest stable version

Author: Arlodotexe

MultiTarget/PackageReferences/WinAppSdk.props

@@ -4,6 +4,6 @@
     <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.756" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Windows.CsWinRT" Version="2.1.0-prerelease.240801.1" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.Windows.CsWinRT" Version="2.1.1" PrivateAssets="all" />
   </ItemGroup>
 </Project>

MultiTarget/WinUI.Extra.props

@@ -33,7 +33,7 @@
 
     <RuntimeIdentifiers Condition="$([MSBuild]::GetTargetFrameworkVersion('$(TargetFramework)')) >= 8">win-x86;win-x64;win-arm64</RuntimeIdentifiers> 
     <RuntimeIdentifiers Condition="8 > $([MSBuild]::GetTargetFrameworkVersion('$(TargetFramework)'))">win10-x86;win10-x64;win10-arm64</RuntimeIdentifiers>
-    <WindowsSdkPackageVersion>10.0.22621.37-preview</WindowsSdkPackageVersion>
+    <WindowsSdkPackageVersion>10.0.22621.39</WindowsSdkPackageVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(IsUno)' == 'true'">