FutureWarning in `workflows.py`

[steinadio]

FutureWarning: arrays to stack must be passed as a "sequence" type such as list or tuple. Support for non-sequence iterables such as generatorsis deprecated as of NumPy 1.16 and will raise an error in the future

[steinadio]

Also printed with the warning:
da = xr.DataArray(np.vstack(dict_flows.values()), dims=('site', 'time')