pin NumPy to build 0 of 1.19.2
pin NumPy to build 0 of 1.19.2

Fixes #8152

numba/numba,numba/numba,cpcloud/numba,numba/numba,numba/numba,cpcloud/numba,cpcloud/numba,numba/numba,cpcloud/numba,cpcloud/numba