[3.12] gh-98040: Fix importbench: use types.ModuleType() (GH-105743) (#105754)

gh-98040: Fix importbench: use types.ModuleType() (GH-105743)

Replace removed imp.new_module(name) with types.ModuleType(name).
(cherry picked from commit 457a459c7804950d4c27a243b176eb933ec87a06)

Co-authored-by: Victor Stinner <vstinner@python.org>