Bump Microsoft.NET.Test.Sdk from 15.9.0 to 16.0.0 in /exercises#1242

ErikSchierboom merged 1 commit intomasterexercism/csharp:masterfrom

dependabot/nuget/exercises/Microsoft.NET.Test.Sdk-16.0.0exercism/csharp:dependabot/nuget/exercises/Microsoft.NET.Test.Sdk-16.0.0Copy head branch name to clipboard