Bump Microsoft.NET.Test.Sdk from 16.3.0 to 16.4.0

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 16.3.0 to 16.4.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v16.3...v16.4.0)

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

test/Swan.Test/Swan.Test.csproj

@@ -21,7 +21,7 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
         </PackageReference>
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.3.0" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
         <packagereference Include="NUnit3TestAdapter" Version="3.15.1"></packagereference>
         <PackageReference Include="NUnit" Version="3.12.0" />
         <PackageReference Include="StyleCop.Analyzers" Version="1.1.118">