Debugger: Remove foreach / Q_FOREACH usage

Task-number: QTCREATORBUG-27464
Change-Id: Ib49afb4d0283aeeffead6b31e1a3d0bcb9a7ae14
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/threadshandler.cpp

@@ -331,7 +331,7 @@ bool ThreadsHandler::notifyGroupExited(const QString &groupId)
         if (item->threadData.groupId == groupId)
             list.append(item);
     });
-    foreach (ThreadItem *item, list)
+    for (ThreadItem *item : qAsConst(list))
         destroyItem(item);
 
     m_pidForGroupId.remove(groupId);