Support zarr >= 3.0

[aseyboldt]

zarr 3.0 is not supported in arviz at the moment see (

arviz/arviz/data/inference_data.py

Line 812 in fae2e4d

if version.parse(zarr.__version__) >= version.parse("3.0.0.dev0"):

).
Version 3.0.0 was released in January, and the last bug fix release for 2.* was in April. I think it would be good to update to the most recent release.