Set default version of numpy to 1.14, to match what we used to build GCP_OPTIMIZED_TF_WHL_FILENAME.
Set default version of numpy to 1.14, to match what we used to build
GCP_OPTIMIZED_TF_WHL_FILENAME.

PiperOrigin-RevId: 191817296

google/deepvariant,google/deepvariant,google/deepvariant