Also changes the resolution of the desktop to 1280x800x32,
timezone to GMT and upgrades Xcode.
Task-number: QTBUG-70180
Change-Id: I4620cbfa3033a100b0e325951a5a9ebcbfa92751
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Liang Qi <liang.qi@qt.io>