sage.geometry.polyhedron.library: Delay import of rings #32780
Description
cherry-picked from #32432 (sagemath-polyhedra)
CC: @kliem
Component: refactoring
Author: Matthias Koeppe
Branch/Commit: 59c0973
Reviewer: Jonathan Kliem
Issue created by migration from https://trac.sagemath.org/ticket/32780