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/projectexplorer/customparserssettingspage.cpp

@@ -104,7 +104,7 @@ private:
                     [](const CustomParserSettings &s1, const CustomParserSettings &s2) {
             return s1.displayName < s2.displayName;
         });
-        for (const CustomParserSettings &s : qAsConst(m_customParsers)) {
+        for (const CustomParserSettings &s : std::as_const(m_customParsers)) {
             const auto item = new QListWidgetItem(s.displayName);
             item->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsEditable);
             m_parserListView.addItem(item);