Fix Qt5 transition imports

Author: krokosik

qtpy/QtStateMachine.py

@@ -21,25 +21,29 @@
         QEventTransition,
         QFinalState,
         QHistoryState,
-        QKeyEventTransition,
-        QMouseEventTransition,
         QSignalTransition,
         QState,
         QStateMachine,
     )
+    from PyQt5.QtWidgets import (
+        QKeyEventTransition,
+        QMouseEventTransition,
+    )
 elif PYSIDE2:
     from PySide2.QtCore import (
         QAbstractState,
         QAbstractTransition,
         QEventTransition,
         QFinalState,
         QHistoryState,
-        QKeyEventTransition,
-        QMouseEventTransition,
         QSignalTransition,
         QState,
         QStateMachine,
     )
+    from PySide2.QtWidgets import (
+        QKeyEventTransition,
+        QMouseEventTransition,
+    )
 elif PYQT6:
     from PyQt6.QtStateMachine import *
 elif PYSIDE6: