Update tests to support CuPy 9 (#7671)
Update tests to support CuPy 9 (#7671)

* Update tests to support CuPy 9

* Skip test_cupy_cholesky if SciPy isn't available
jakirkham/dask,dask/dask,jakirkham/dask,dask/dask,blaze/dask,blaze/dask