chore: ngen cal pin fiona<1.10.0; python < 3.9

fiona v 1.10.0 deprecated  'fiona.path' field (seem to have been removed?)
https://github.com/Toblerity/Fiona/releases/tag/1.10.0

geopandas geojson reader uses fiona.

geopandas v0.14 dropped support for python<3.9. so, ngen.cal
installations are effectively pinned to geopandas <= v0.14.
transitively, ngen.cal needs to pin fiona<1.10.0 for compatibility.
https://geopandas.org/en/stable/docs/changelog.html#version-0-14-sep-15-2023

python/ngen_cal/setup.cfg

@@ -34,6 +34,7 @@ install_requires =
     pydantic<2
     pandas>=1.1.2
     geopandas
+    fiona<1.10.0; python_version < "3.9"
     matplotlib
     hydrotools.metrics
     hydrotools.nwis_client