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/coreplugin/find/findplugin.cpp

@@ -301,7 +301,7 @@ void FindPrivate::setupFilterMenuItems()
     const Id base("FindFilter.");
     QList<IFindFilter *> sortedFilters = IFindFilter::allFindFilters();
     Utils::sort(sortedFilters, &IFindFilter::displayName);
-    for (IFindFilter *filter : qAsConst(sortedFilters)) {
+    for (IFindFilter *filter : std::as_const(sortedFilters)) {
         QAction *action = new QAction(filterActionName(filter), this);
         bool isEnabled = filter->isEnabled();
         if (isEnabled)