Bump Microsoft.NET.Test.Sdk from 16.5.0 to 16.9.4 (#49)

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 16.5.0 to 16.9.4.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v16.5.0...v16.9.4)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

src/common.props

@@ -16,6 +16,6 @@
   </PropertyGroup>
   <PropertyGroup>
     <XunitVersion>2.4.1</XunitVersion>
-    <TestSdkVersion>16.5.0</TestSdkVersion>
+    <TestSdkVersion>16.9.4</TestSdkVersion>
   </PropertyGroup>
 </Project>