usage of numpy.asarray

[maverick-7487]

removes a Deprecation Warning message from np.array

DeprecationWarning: __array__ implementation doesn't accept a copy keyword, so passing copy=False failed. __array__ must implement 'dtype' and 'copy' keyword arguments. To learn more, see the migration guide https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword
  ref  = np.array(ncIN.variables['REFERENCE_DATE_TIME']).tobytes().decode()