build(deps): bump Microsoft.NET.Test.Sdk from 16.5.0 to 16.6.0 (#572)

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 16.5.0 to 16.6.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v16.5.0...v16.6.0)

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

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

Author: dependabot-preview[bot]

src/Akavache.Tests/Akavache.Tests.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.0" />
     <PackageReference Include="Microsoft.Reactive.Testing" Version="4.4.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.console" Version="2.4.1" />