build(deps): bump Microsoft.NET.Test.Sdk from 15.9.0 to 16.2.0 (#25)

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 15.9.0 to 16.2.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v15.9.0...v16.2.0)

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

src/Directory.build.props

@@ -27,7 +27,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="$(IsTestProject)">
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
     <PackageReference Include="Xunit.StaFact" Version="0.3.18" />