Fixing bug when depth_not_set and auto-chunking
Fixing bug when depth_not_set and auto-chunking

In auto-chunking the grid of the depth is not the same as the grid of the the velocity, so we need to also update the grid.depth_field of the depth_field.
This fixes test_swash('jit', 'auto') in example_dask_chunk_OCMs.py

OceanPARCELS/parcels,OceanPARCELS/parcels