Update zarr version in ci

Author: mpiannucci

.github/workflows/ci.yaml

@@ -67,7 +67,7 @@ jobs:
         shell: "bash -l {0}"
         run: |
           conda activate env
-          python -m pip install zarr==3.0.0a0
+          python -m pip install zarr==3.0.0b0
 
       # This is used to test with zfpy, which does not yet support numpy 2.0
       - name: Install older numpy and zfpy