mark qmlweather examples main.qml as security sensitive

Example makes Http GET request, response text gets parsed into JSON object and the JSON object is passed on to parsing function which parses the data for chart series

Task-number: QTBUG-135749
Pick-to: 6.9 6.8
Change-Id: I53503e44b4adb86c1fce48cd6a72a9c624bf7592
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>

examples/charts/qmlweather/qml/qmlweather/main.qml

@@ -1,5 +1,6 @@
 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+// Qt-Security score:critical reason:data-parser
 
 import QtQuick
 import QtCharts