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[3.14] gh-135410: use a critical section around `StringIO.__next__` (GH-135412) (#135425)

gh-135410: use a critical section around `StringIO.__next__` (GH-135412)
(cherry picked from commit e6c3039cb39e68ae9af9ddcaca341c5af8f9cf23)

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
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Miss Islington (bot) committed
8cb7d9a8102163387907425dc14b5d629b930e76
Parent: e76dbc8
Committed by GitHub <noreply@github.com> on 6/12/2025, 11:36:44 AM