Fix qHash-related size compatibility warnings by MSVC

Change-Id: I3b7981ce78b67db4b996f99682284a0b911d8cd7
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/texteditor/texteditor.cpp

@@ -8255,7 +8255,7 @@ IEditor *BaseTextEditor::duplicate()
 
 QT_BEGIN_NAMESPACE
 
-uint qHash(const QColor &color)
+Utils::QHashValueType qHash(const QColor &color)
 {
     return color.rgba();
 }