Update nuget packages and dotnet tools versions

[cschuchardt88]

You need to update the dotnet tools, alot of new users dont know what to do. I am not one of those people but in the neo discord server there is a lot of new users that are having problems. Also you should update the nuget packages as well, the nuget packages isnt so much a problem.

Workaround

dotnet-tools.json

{
  "version": 1,
  "isRoot": true,
  "tools": {
    "neo.compiler.csharp": {
      "version": "3.6.0",
      "commands": [
        "nccs"
      ]
    },
    "neo.express": {
      "version": "3.5.20",
      "commands": [
        "neoxp"
      ]
    }
  }
}