Fix t-route integration tests requiring fiona

[program--]

geopandas<1.0.0 included fiona as a required dependency. However, since v1.0.0, they switched to using pyogrio as the default engine for I/O -- as a result, fiona is currently an unspecified dependency in t-route.

Changes

• Include fiona in pip install call in CI

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[PhilMiller]

Is there a corresponding fix for t-route itself?

[PhilMiller]

I.e. is the right thing to do to add it to t-route's requirements.txt instead?

[program--]

Is there a corresponding fix for t-route itself?

Yeah, my brain is frazzled. I did this, but then just reached out to Sean a few minutes ago and realized the actual fix is just to add fiona to the pyproject.toml in troute.network 🤦

At the very least, the CI runs here show me that's all the issue is haha

EDIT: NOAA-OWP/t-route#827