Shapely example needs to be updated

[banesullivan]

/home/bane/Software/pyvista/pyvista/pyvista/examples/downloads.py:5369: UserWarning: Unpickling a shapely <2.0 geometry object. Please save the pickle again; shapely 2.1 will not have this compatibility.
  return pickle.load(Path(filename).open('rb'))  # noqa: SIM115

Specifically this file https://github.com/pyvista/vtk-data/blob/master/Data/osmnx_graph.p

[user27182]

This example was deprecated in pyvista for this reason, see

• download_osmnx_graph produces a deprecation warning for the shapely package pyvista#5812
• Deprecate download_osmnx_graph download function pyvista#6107

Not sure if it's worth modifying the dataset here or if it should be removed completely from this repo or, just kept here for legacy reasons (but not used by PyVista)

[banesullivan]

I think leaving here for legacy reasons is best and just closing this issue since it's no longer needed in PyVista