Skip tst_QScroller::scroll(), it's flakey and blocking CI

Task-number: QTBUG-30133
Change-Id: I2d91d92e49480b904dec9807d4763c461e809bd2
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

tests/auto/widgets/util/qscroller/tst_qscroller.cpp

@@ -391,6 +391,7 @@ void tst_QScroller::scrollTo()
 
 void tst_QScroller::scroll()
 {
+    QSKIP("Flakey test - https://bugreports.qt-project.org/browse/QTBUG-30133");
 #ifndef QT_NO_GESTURES
     // -- good case. normal scroll
     tst_QScrollerWidget *sw = new tst_QScrollerWidget();