update Microsoft.NET.Test.Sdk to 16.6.1

Author: SimonCropp

test/Serilog.Sinks.Console.Tests/Serilog.Sinks.Console.Tests.csproj

@@ -15,7 +15,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" PrivateAssets="all" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />