Fix computer use issues

[ptrkstr]

Version matching

Computer use only works with a newer model version of sonnet

Tool encoding

Tools were being encoded as:

"tools": [
  {
    "computer": {
      "_0": {
        "display_height_px": 768,
        "display_number": 1,
        "display_width_px": 1024,
        "type": "computer_20241022",
        "name": "computer"
      }
    }
  }
],

But they should be encoded as

"tools": [
  {
    "display_number": 1,
    "name": "computer",
    "type": "computer_20241022",
    "display_width_px": 1024,
    "display_height_px": 768
  }
],

[fumito-ito]

Thanks!

[ptrkstr]

I have fixed the failing test 😅