QXmlStreamSimpleStack: disable copy and move SMFs

Clazy complained that the class has a dtor, but no copy ctor.

Pick-to: 6.3
Change-Id: Ida4024df1ff22c7758b8efa6e9383e03734720a8
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

src/corelib/serialization/qxmlstream_p.h

@@ -127,6 +127,8 @@ using namespace QtPrivate;
 
 template <typename T> class QXmlStreamSimpleStack
 {
+    Q_DISABLE_COPY_MOVE(QXmlStreamSimpleStack)
+
     T *data;
     qsizetype tos, cap;
 public: