Update rpc_utils.py
Update rpc_utils.py

When using exogenous_dem option - the function min_max_heights_from_bbx calls

x_im_proj, y_im_proj, __ = (zip(*lonlat_to_im.TransformPoints(lonlatalt)))
however lonlatalt is not a sequence as TransformPoints is expecting.

Instead changed to:
x_im_proj, y_im_proj, __ = (zip(*lonlat_to_im.TransformPoints([a for a in lonlatalt])))
dyoussef/s2p,mnhrdt/s2p,MISS3D/s2p,MISS3D/s2p,MISS3D/s2p,dyoussef/s2p,mnhrdt/s2p,dyoussef/s2p,dyoussef/s2p,carlodef/s2p,MISS3D/s2p,carlodef/s2p