dpctl.tensor.asarray incorrect dtype

``` python
import dpctl.tensor as dpt
import numpy as np

a = np.ndarray(1, dtype=np.uint64)
b = dpt.asarray(a)
print('a.dtype =', a.dtype, '\nb.dtype =', b.dtype)
```
output:
```
a.dtype = uint64
b.dtype = int64
```