Update dependency Microsoft.NET.Test.Sdk to 17.12.0

Author: renovate[bot]

src/Directory.Build.props

@@ -43,7 +43,7 @@
       </PropertyGroup>
 
       <ItemGroup>
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
           <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
           <PrivateAssets>all</PrivateAssets>