Bump Microsoft.NET.Test.Sdk from 16.5.0 to 16.6.1 (#174)

Author: dependabot-preview[bot]

src/common.props

@@ -11,7 +11,7 @@
   </PropertyGroup>
   <PropertyGroup>
     <XunitVersion>2.4.1</XunitVersion>
-    <TestSdkVersion>16.5.0</TestSdkVersion>
+    <TestSdkVersion>16.6.1</TestSdkVersion>
     <NBenchVersion>1.2.2</NBenchVersion>
   </PropertyGroup>
 </Project>