build(deps): bump Microsoft.NET.Test.Sdk from 16.9.1 to 16.9.4 in /src (#2723)

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] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/Directory.build.props

@@ -34,7 +34,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="$(IsTestProject)">
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.console" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />

src/ReactiveUI.Fody.Analyzer.Test/ReactiveUI.Fody.Analyzer.Test.csproj

@@ -8,7 +8,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.2" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.9.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Include="xunit" Version="2.4.1" />
   </ItemGroup>
   <ItemGroup>