Ironically, since this was merged, test_importlib started leaking on refleaks buildbots.

Originally posted by @encukou in #116680 (comment)

Linked PRs

• gh-116731: Fix refleaks in importlib tests #116763
• gh-116731: libregrtest: Clear inspect & importlib.metadata caches in clear_caches #116805
• [3.12] gh-116731: libregrtest: Clear inspect & importlib.metadata caches in clear_caches (GH-116805) #116820