Update numpy/ma/core.pyi

Co-authored-by: Joren Hammudoglu <[email protected]>

Author: MarcoGorelli

numpy/ma/core.pyi

@@ -351,7 +351,7 @@ class MaskedArray(ndarray[_ShapeType_co, _DType_co]):
     @property
     def dtype(self) -> _DType_co: ...
     @dtype.setter
-    def dtype(self: MaskedArray[_ShapeType_co, _DType], dtype: _DType, /,) -> None: ...
+    def dtype(self: MaskedArray[Any, _DType], dtype: _DType, /) -> None: ...
     @property
     def shape(self) -> _ShapeType_co: ...
     @shape.setter