update iohub branch

Author: pattonw

pyproject.toml

@@ -65,4 +65,4 @@ module = ["zarr.*", "iohub.*"]
 ignore_missing_imports = true
 
 [tool.uv.sources]
-iohub = { git = "https://github.com/czbiohub-sf/iohub", rev = "273-use-zarr-python-3" }
+iohub = { git = "https://github.com/czbiohub-sf/iohub", rev = "zarr3-dev" }