Use QEnterEvent for QWidget::enterEvent on Qt 6 (#4365)

* fix: use concrete QEnterEvent on Qt 6

* chore: add changelog entry

src/widgets/helper/NotebookTab.cpp

@@ -674,7 +674,11 @@ void NotebookTab::mouseDoubleClickEvent(QMouseEvent *event)
     }
 }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+void NotebookTab::enterEvent(QEnterEvent *event)
+#else
 void NotebookTab::enterEvent(QEvent *event)
+#endif
 {
     this->mouseOver_ = true;