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Revert "gh-135410: use a critical section around `StringIO.__next__` (#135412)" (#135439)

This reverts commit e6c3039cb39e68ae9af9ddcaca341c5af8f9cf23.
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Peter Bierma committed
73431356d324842cac0d545018c3ad21c85bc883
Parent: b03309f
Committed by GitHub <noreply@github.com> on 6/12/2025, 10:32:27 PM