cannot unmarshal object into Go struct field Board.panels of type string

```
func (m *manager) DashboardPanels(ctx context.Context, uid string) ([]*grafanasdk.Panel, error) {
	board, _, err := m.grafanaClient.GetDashboardByUID(ctx, uid)
	if err != nil {
		return nil, err
	}
	return board.Panels, nil
}
```

So strange, i have checked my dashboard json file, the panels field, it is an array not a string