Bump Microsoft.NET.Test.Sdk from 16.8.0 to 16.9.4

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 16.8.0 to 16.9.4.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v16.8.0...v16.9.4)

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

tests/AED.Test/AED.Test.fsproj

@@ -28,7 +28,7 @@
         <PackageReference Include="FsCheck" Version="3.0.0-alpha4" />
         <PackageReference Include="FsCheck.Xunit" Version="3.0.0-alpha4" />
         <PackageReference Include="FsUnit.xUnit" Version="4.0.2" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.0" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
         <PackageReference Include="coverlet.collector" Version="1.3.0">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

tests/Acoustics.Test/Acoustics.Test.csproj

@@ -19,7 +19,7 @@
     </PackageReference>
     <PackageReference Include="FastMember" Version="1.5.0" />
     <PackageReference Include="ImmediateReflection" Version="1.6.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Include="Moq" Version="4.15.1" />
     <PackageReference Include="MSTest.TestAdapter" Version="2.1.2" />
     <PackageReference Include="MSTest.TestFramework" Version="2.1.2" />