Fix type used for group argument in xarray tests (#1081)

* Fix type used for group argument in xarray tests

* Fix test

Author: maxrjones

src/titiler/xarray/tests/test_io_tools.py

@@ -135,7 +135,7 @@ def test_zarr_group(group):
     """test reader."""
     src_path = os.path.join(prefix, "pyramid.zarr")
 
-    with Reader(src_path, variable="dataset", group=group) as src:
+    with Reader(src_path, variable="dataset", group=str(group)) as src:
         assert src.info()
         assert src.tile(0, 0, 0)
         assert src.point(0, 0).data[0] == group * 2 + 1