Detected Memory leaks in code numpy as_type() (working on PR)

[Scartography]

as type copies arrays when not specified otherwise see: https://numpy.org/doc/stable/reference/generated/numpy.ndarray.astype.html

• https://github.com/bopen/xarray-sentinel/blob/main/xarray_sentinel/sentinel1.py#L741
• https://github.com/bopen/xarray-sentinel/blob/main/xarray_sentinel/sentinel1.py#L746

Seems to be reason for tests failing in sarsen, will try working more on this and PR is "underway"