[3.13] gh-71587: Drop local reference cache to _strptime
module in _datetime
(gh-120224)
#120424
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The _strptime module object was cached in a static local variable (in the datetime.strptime() implementation). That's a problem when it crosses isolation boundaries, such as reinitializing the runtme or between interpreters. This change fixes the problem by dropping the static variable, instead always relying on the normal sys.modules cache (via PyImport_Import()).
(cherry picked from commit 127c1d2)
Co-authored-by: neonene 53406459+neonene@users.noreply.github.com