gh-141431: interpret ZIP timestamps as UTC #143953
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ZIP (DOS) timestamps do not include timezone information, but CPython currently
interprets them as local time via time.mktime(). This can cause .pyc files to be
incorrectly marked as stale when a zipapp is created and run in different
timezones.
This change uses calendar.timegm() so ZIP source timestamps are interpreted with
UTC semantics, matching .pyc timestamp handling.
Fixes gh-141431