Test with multiple zarr versions

Author: dstansby

.github/workflows/ci.yaml

@@ -13,8 +13,10 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.11", "3.12", "3.13"]
+        zarr-version: ["3.0.*", "3.1.*"]
         # macos-13 is an intel runner, macos-14 is an arm64 runner
-        platform: [ubuntu-latest, ubuntu-22.04-arm, windows-latest, macos-13, macos-14]
+        platform:
+          [ubuntu-latest, ubuntu-22.04-arm, windows-latest, macos-13, macos-14]
 
     defaults:
       run:
@@ -51,6 +53,7 @@ jobs:
         run: |
           export DISABLE_NUMCODECS_AVX2=""
           python -m pip install -v -e .[test,test_extras,msgpack,crc32c,pcodec,zfpy]
+          python -m pip install zarr==${{ matrix.zarr-version }}
 
       - name: Install zarr-python
         # Since zarr v3 requires numpy >= 1.25, on Python 3.11 leave it out