Fix geopandas CRS warning

[visr]

Fixes #1799
This looks into the parent class to set the CRS of the Node table directly after it is created.
That means we also don't have to do this (and create an extra copy) each time we call node_table.

[evetion]

Thanks for fixing this, I forgot to make an issue after @DanielTollenaar mentioned this warning. LGTM, but this means we can remove the set_crs from the write method, and from

Ribasim/python/ribasim/ribasim/model.py

Line 297 in 6347146

df_chunks = [node.node.df.set_crs(self.crs) for node in self._nodes()]

as well.