Pick up Zarr 2.11.2

[jeromekelleher]

zarr-developers/zarr-python#1002

Should help with some workarounds we had to make. @benjeffery you're closest to this one, mind picking it up?

[jeromekelleher]

Note that we should make this 2.11.3, and probably pin against 2.11.2 as it may still be broken for us:

zarr-developers/zarr-python#1005 (review)