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/languageclient/languageclientutils.cpp

@@ -183,7 +183,7 @@ void updateCodeActionRefactoringMarker(Client *client,
                 } else if (std::optional<WorkspaceEdit::Changes> localChanges = edit->changes()) {
                     edits = (*localChanges)[uri];
                 }
-                for (const TextEdit &edit : qAsConst(edits))
+                for (const TextEdit &edit : std::as_const(edits))
                     addMarkerForCursor(action, edit.range());
             }
         }