[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

xarray/tests/test_async.py

@@ -191,6 +191,6 @@ async def test_indexing(self, memorystore) -> None:
 
         # test vectorized indexing
         # TODO this shouldn't pass! I haven't implemented async vectorized indexing yet...
-        indexer = xr.DataArray([2, 3], dims=['x'])
+        indexer = xr.DataArray([2, 3], dims=["x"])
         result = await ds.foo[indexer].load_async()
         xrt.assert_identical(result, ds.foo[indexer].load())