Only run one 3.0.x test

Author: dstansby

.github/workflows/ci.yaml

@@ -13,10 +13,16 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.11", "3.12", "3.13"]
-        zarr-version: ["3.0.*", "3.1.*"]
+        # Run full test matrix on latest version of zarr
+        zarr-version: ["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]
+        include:
+          # Add one test run for zarr 3.0.x
+          - zarr-version: "3.0.*"
+            python-version: "3.11"
+            platform: "ubuntu-latest"
 
     defaults:
       run: