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/python/pythonsettings.cpp

@@ -829,7 +829,7 @@ void PythonSettings::initFromSettings(QSettings *settings)
             m_interpreters << interpreter;
     }
 
-    for (const Interpreter &interpreter : qAsConst(oldSettings)) {
+    for (const Interpreter &interpreter : std::as_const(oldSettings)) {
         if (Utils::anyOf(m_interpreters, Utils::equal(&Interpreter::id, interpreter.id)))
             continue;
         m_interpreters << interpreter;