sage.combinat, .matroids, .geometry: Fix use of MixedIntegerLinearProgram #32221
Description
Part of #32191 (Meta-ticket: Audit/fix all uses of MixedIntegerLinearProgram in sage.combinat, sage.graphs)
sage.combinat.designs is taken care of in #32218
Depends on #32197
CC: @tscrim @dimpase @dcoudert
Component: combinatorics
Author: Matthias Koeppe
Branch/Commit: affdfab
Reviewer: David Coudert
Issue created by migration from https://trac.sagemath.org/ticket/32221