Description:
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When using DateTime::setTime() and setting the time to a time that doesn't exist (during a DST jump forward), the timestamp is correct, but the hour does not move forward.

Test script:
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$tz = new DateTimeZone('America/Chicago');
$date = new DateTime('2020-03-08 01:00:00', $tz);
$date->setTime(2,0);
var_dump($date->format(DateTime::ATOM));

Expected result:
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string(25) "2020-03-08T03:00:00-05:00"

Actual result:
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string(25) "2020-03-08T02:00:00-05:00"