Backport PR #15168 on branch v3.1.x (MNT: explicitly cast np.bool_ -> bool to prevent deprecation warning) - #15185

Backport PR #15168 on branch v3.1.x (MNT: explicitly cast np.bool_ -> bool to prevent deprecation warning)#15185

tacaswell merged 1 commit into

matplotlib:v3.1.xmatplotlib/matplotlib:v3.1.xfrom

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