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Fix test_generators: save/restore warnings filters (#108246)

Previously, depending on existing filters, the test
could modify the warnings and so fail as "env changed".
V
Victor Stinner committed
531930f47f6b2a548d31e62cb4ad3e215a24bf53
Parent: a1cc74c
Committed by GitHub <noreply@github.com> on 8/21/2023, 11:41:13 PM