Bump Microsoft.NET.Test.Sdk from 17.2.0 to 17.13.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 17.13.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

samples/snippets/csharp/tutorials/nullable-reference-migration/start/SimpleFeedReader.Tests/SimpleFeedReader.Tests.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageReference Include="Microsoft.AspNetCore.App"  />
     <PackageReference Include="Moq" Version="4.18.1" />
     <PackageReference Include="xunit" Version="2.4.1" />