CI: Linux py37_np_dev Concatenation operation is not implemented for NumPy arrays, use np.concatenate() instead.
https://github.com/numpy/numpy/commit/8ac7ac94ab868473e2276902be656946745c641f

https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=38318&view=logs&j=3a03f79d-0b41-5610-1aa4-b4a014d0bc70&t=4d05ed0e-1ed3-5bff-dd63-1e957f2766a9