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-preview[bot] <support@dependabot.com>

src/FluffySpoon.Automation.Web.Tests/FluffySpoon.Automation.Web.Tests.csproj

@@ -9,7 +9,7 @@
 	<ItemGroup>
 		<PackageReference Include="Microsoft.AspNetCore" Version="2.2.0" />
 		<PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="2.2.0" />
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
 		<PackageReference Include="MSTest.TestAdapter" Version="2.2.3" />
 		<PackageReference Include="MSTest.TestFramework" Version="2.2.3" />
 	</ItemGroup>