Bump Microsoft.VSSDK.BuildTools from 17.11.435 to 17.12.2069 in /docs/csharp/roslyn-sdk/tutorials/snippets/how-to-write-csharp-analyzer-code-fix/MakeConst/MakeConst.Vsix in the dotnet group

Bump Microsoft.VSSDK.BuildTools from 17.11.435 to 17.12.2069 in /docs/csharp/roslyn-sdk/tutorials/snippets/how-to-write-csharp-analyzer-code-fix/MakeConst/MakeConst.Vsix in the dotnet group #822