Zarr v3 now requires at least Python 3.11 (#585)

See zarr-developers/zarr-python#2217

Author: tomwhite

.github/workflows/zarr-v3-tests.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest"]
-        python-version: ["3.10"]
+        python-version: ["3.11"]
 
     steps:
       - name: Checkout source