Update numpy to 1.21.4, networkx to 2.6.3 #32815
Description
https://github.com/numpy/numpy/releases
1.21.4 still supports Python 3.7; fixes a bug on Apple Silicon
https://github.com/networkx/networkx/releases/tag/networkx-2.6.3
Component: packages: standard
Author: Matthias Koeppe
Branch/Commit: e2ad5ae
Reviewer: François Bissey
Issue created by migration from https://trac.sagemath.org/ticket/32815