Exclude broken zarr versions, due to #828

Author: tomwhite

requirements.txt

@@ -6,7 +6,7 @@ dask-ml
 scipy
 typing-extensions
 numba
-zarr >= 2.10.0, < 2.11.0
+zarr >= 2.10.0, != 2.11.0, != 2.11.1, != 2.11.2
 fsspec != 2021.6.*
 scikit-learn
 pandas < 1.4.0