Update PyQt5-stubs/QtCore.pyi

Author: altendky

PyQt5-stubs/QtCore.pyi

@@ -35,7 +35,10 @@ class pyqtBoundSignal:
 
     def emit(self, *args: typing.Any) -> None: ...
     def connect(self, slot: "PYQT_SLOT") -> "QMetaObject.Connection": ...
-    def disconnect(self, slot: typing.Optional[typing.Union["PYQT_SLOT", "QMetaObject.Connection"]]=None) -> None: ...
+    @typing.overload
+    def disconnect(self) -> None: ...
+    @typing.overload
+    def disconnect(self, slot: typing.Union["PYQT_SLOT", "QMetaObject.Connection"]) -> None: ...
 
 
 class pyqtSignal: