Various Qt6 compile fixes

Task-number: QTCREATORBUG-24098
Change-Id: Ia0fe92d82d4477bd8f14ee25754b114316fc878a
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/dialogs/readonlyfilesdialog.cpp

@@ -465,7 +465,7 @@ void ReadOnlyFilesDialogPrivate::initDialog(const FilePaths &filePaths)
 
         // Also save the buttongroup for every file to get the result for each entry.
         buttonGroups.append({filePath, radioButtonGroup});
-        QObject::connect(radioButtonGroup, QOverload<int>::of(&QButtonGroup::buttonClicked),
+        QObject::connect(radioButtonGroup, QOverload<QAbstractButton *>::of(&QButtonGroup::buttonClicked),
                          [this] { updateSelectAll(); });
     }