Update expected warning

Author: maxrjones

tests/test_store/test_core.py

@@ -268,6 +268,6 @@ def test_different_open_mode() -> None:
     zarr.create((100,), store=store, zarr_format=2, path="a")
     with pytest.warns(
         UserWarning,
-        match="Store is not read-only but mode is 'r'. Attempting to create a read-only copy. This behavior may change in the future with a more granular permissions model.",
+        match="Store is not read-only but mode is 'r'. Creating a read-only copy. This behavior may change in the future with a more granular permissions model",
     ):
         zarr.open_array(store=store, path="a", zarr_format=2, mode="r")