OSM: fix spatialpandas error

[maximlt]

The notebook starts with

import spatialpandas as spd
df = spd.io.read_parquet_dask('./data/osm-1billion.parq')

And that fails with:

ValueError: A spatialpandas GeoDataFrame must contain at least one spatialpandas GeometryArray column

The parquet file has just x and y columns as far as I can see. What is surprising to me is that my environment has the version with which the project was last locked (0.4.3), something must have gone wrong.