compatibility with numpy>2.0

numpy >2.0 is not backwards compatible, and specifically fails in the endian/byteorder check. An updated implementation (along with explicitly specifying the proper endianness) that is compliant with the changes made in numpy 2.0 and later would be:

```
# Convert to native byte order
# This is needed for working with pandas data structures
sys_is_le = sys.byteorder == 'little'
native_code = '<' if sys_is_le else '>'
swapped_code = '>' if sys_is_le else '<'
if endian != native_code:
# swaps the actual bytes and also the endianness
# updated to be numpy>= 2.0 compliant
data = data.view(data.dtype.newbyteorder(swapped_code)).byteswap()
```