Bump Microsoft.NET.Test.Sdk from 16.9.1 to 16.9.4

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)

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

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" />