Switch app code to PyQt6

novelwriter/extensions/modified.py

@@ -30,9 +30,9 @@ from __future__ import annotations
 from enum import Enum
 from typing import TYPE_CHECKING
 
-from PyQt5.QtCore import QSize, Qt, pyqtSignal, pyqtSlot
-from PyQt5.QtGui import QMouseEvent, QWheelEvent
-from PyQt5.QtWidgets import (
+from PyQt6.QtCore import QSize, Qt, pyqtSignal, pyqtSlot
+from PyQt6.QtGui import QMouseEvent, QWheelEvent
+from PyQt6.QtWidgets import (
     QApplication, QComboBox, QDialog, QDoubleSpinBox, QLabel, QSpinBox,
     QToolButton, QWidget
 )