Fix for transient dependencies on Microsoft.Windows.SDK.Contracts NuGet.

Directory.Build.targets

@@ -7,7 +7,7 @@
       </PropertyGroup>
       <ItemGroup>
         <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.6.2" PrivateAssets="all"/>
-        <PackageReference Include="Microsoft.Windows.SDK.Contracts" Version="10.0.18362.2002-preview" />
+        <PackageReference Include="Microsoft.Windows.SDK.Contracts" Version="10.0.18362.2002-preview" PrivateAssets="analyzers"/>
       </ItemGroup>
     </When>
   </Choose>