Bump Microsoft.NET.Test.Sdk from 17.10.0 to 17.11.0 in /docs/csharp/roslyn-sdk/tutorials/snippets/how-to-write-csharp-analyzer-code-fix/MakeConst/MakeConst.Test

Bump Microsoft.NET.Test.Sdk from 17.10.0 to 17.11.0 in /docs/csharp/roslyn-sdk/tutorials/snippets/how-to-write-csharp-analyzer-code-fix/MakeConst/MakeConst.Test #1580