Only `float` type should automatically convert to `System.Double` when target type is `System.Object`

### Environment

-   Pythonnet version: 3.0.0

### Details

```csharp
var numpy = Py.Import("numpy");
var float64 = numpy.GetAttr("float64");
var float64Value = float64.Invoke(42.ToPython());
Console.WriteLine(float64Value.As<object>().GetType());
```

**Expected:** `Python.Runtime.PyObject`
**Actual**: `System.Double`