No change to QLocale's data, one addition to the Windows time-zone
data. What was formerly "Us Mountain Standard time / Canada" is now
Yukon Standard Time.
Fixes: QTBUG-89784
Pick-to: 6.0 5.15
Change-Id: I4c9a23620e74ea379be8a4c5ba0896d35fe9b594
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>