Bump Microsoft.NET.Test.Sdk from 16.8.0 to 16.8.3

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 16.8.0 to 16.8.3.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v16.8.0...v16.8.3)

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

Author: dependabot-preview[bot]

Tests/Directory.Build.props

@@ -6,7 +6,7 @@
     <PackageReference Include="coverlet.collector" PrivateAssets="All" Version="1.3.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
     <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="16.8.0" />
     <PackageReference Include="Moq" Version="4.15.2" />
     <PackageReference Include="xunit" Version="2.4.1" />