src/sage_docbuild/conf.py: Unless SAGE_DOC_REMOTE_INVENTORIES=yes, do not contact remotes; use vendored inventories for scipy, flint
References
#37575 - Intersphinx for cvxopt, cvxpy, cypari2, cysignals, flint, fpylll, gmpy2, ipywidgets, matplotlib, mpmath, networkx, numpy, rpy2, scipy, sympy