Port from qAsConst() to std::as_const()

We've been requiring C++17 since Qt 6.0, and our qAsConst use finally
starts to bother us (QTBUG-99313), so time to port away from it
now.

Since qAsConst has exactly the same semantics as std::as_const (down
to rvalue treatment, constexpr'ness and noexcept'ness), there's really
nothing more to it than a global search-and-replace.

Task-number: QTBUG-99313
Change-Id: I88edd91395849574436299b8badda21bb93bea39
Reviewed-by: hjk <hjk@qt.io>

src/plugins/qmldesigner/components/curveeditor/animationcurve.cpp

@@ -363,7 +363,7 @@ void AnimationCurve::analyze()
             m_maxY = e.y();
     }
 
-    for (auto &frame : qAsConst(m_frames)) {
+    for (auto &frame : std::as_const(m_frames)) {
         if (frame.position().y() < m_minY)
             m_minY = frame.position().y();