Bump Microsoft.NET.Test.Sdk from 16.5.0 to 16.6.1

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 16.5.0 to 16.6.1.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v16.5.0...v16.6.1)

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

src/common.props

@@ -13,7 +13,7 @@
   </PropertyGroup>
   <PropertyGroup>
     <XunitVersion>2.4.1</XunitVersion>
-    <TestSdkVersion>16.5.0</TestSdkVersion>
+    <TestSdkVersion>16.6.1</TestSdkVersion>
     <AkkaVersion>1.4.5</AkkaVersion>
   </PropertyGroup>
   <!-- SourceLink support for all Akka.NET projects -->