Update package deps for doc building.
Update package deps for doc building.

Swap bootstrap for RTD.

seibert/numba,IntelLabs/numba,sklam/numba,numba/numba,seibert/numba,stuartarchibald/numba,stonebig/numba,stonebig/numba,gmarkall/numba,IntelLabs/numba,sklam/numba,stonebig/numba,cpcloud/numba,gmarkall/numba,numba/numba,stuartarchibald/numba,stonebig/numba,cpcloud/numba,seibert/numba,cpcloud/numba,sklam/numba,sklam/numba,stuartarchibald/numba,numba/numba,IntelLabs/numba,IntelLabs/numba,seibert/numba,numba/numba,stuartarchibald/numba,cpcloud/numba,numba/numba,seibert/numba,gmarkall/numba,sklam/numba,cpcloud/numba,gmarkall/numba,gmarkall/numba,IntelLabs/numba,stuartarchibald/numba,stonebig/numba