Fix np.load call for np v1.16.3 (#12714) ยท keras-team/keras@9416f36

Numpy 1.16.3 changed the default value for the allow_pickle flag. So this load call breaks. https://nvd.nist.gov/vuln/detail/CVE-2019-6446 https://github.com/numpy/numpy/blob/v1.16.2/numpy...