Bump Microsoft.NET.Test.Sdk from 16.9.1 to 16.9.4 (#554)

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 16.9.1 to 16.9.4.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v16.9.1...v16.9.4)

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Author: dependabot[bot]

Directory.Build.targets

@@ -25,7 +25,7 @@
         <PackageReference Update="Microsoft.Extensions.Options.ConfigurationExtensions" Version="2.0.0"/>
         <PackageReference Update="Microsoft.Extensions.DependencyInjection" Version="2.0.0"/>
         <PackageReference Update="Newtonsoft.Json" Version="11.0.2"/>
-        <PackageReference Update="Microsoft.NET.Test.Sdk" Version="16.9.1"/>
+        <PackageReference Update="Microsoft.NET.Test.Sdk" Version="16.9.4"/>
         <PackageReference Update="xunit.runner.visualstudio" Version="2.4.3"/>
         <PackageReference Update="xunit" Version="2.4.1"/>
         <PackageReference Update="FluentAssertions" Version="5.10.3"/>