[3.11] gh-117914: fix datetime_strptime when restart cpython by marin-man · Pull Request #117915 · python/cpython

• Issue: datetime_strptime is 'NoneType' when restart cpython #117914

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3.11 is in security-only mode.

(FYI, the equivalent of this change has been merged on main (3.14) via gh-120224. We will be backporting that to 3.13 and 3.12.)