upgrade deps

[barne856]

Removes pinned/capped versions of the following dependencies:

Package	Before	After
pandas	>=2.0,<3.0	>=2.0
xarray	<=2025.4.0	unpinned
geopandas	>=1.0,<2.0	>=1.0
zarr (dev)	==2.18.2	>=3.0
fiona (dev)	==1.9.6	>=1.10
kerchunk (dev)	unpinned (resolved to 0.2.7)	>=0.2.9
numcodecs (dev)	<0.16	>=0.15

Test fixtures are also updated to work with updated versions.

Verificaiton

All pytest tests pass

[thwllms]

@barne856 awesome! Much appreciated. Can you update the version number to 0.12.0 before merging?

[barne856]

@thwllms I cannot merge this since there is a pending check outstanding that we don't need anymore