Possible problem with interp1d in uncertainty.py

On line https://git.ligo.org/Calibration/pydarm/-/blob/cmd-dev/pydarm/uncertainty.py?ref_type=heads#L622 , we are using interp1d which is nominally a real value only function according to the docs.

https://docs.scipy.org/doc/scipy-1.9.3/reference/generated/scipy.interpolate.interp1d.html?highlight=interp1d#scipy.interpolate.interp1d

We think this might be affecting the gpr sampling used in the uncertainty budget.