Update type hint for point change

Author: MyreMylar

buildconfig/stubs/pygame/rect.pyi

@@ -95,7 +95,7 @@ class _GenericRect(Collection[_N]):
     @property
     def rel_center(self) -> Tuple[_N, _N]: ...
     @rel_center.setter
-    def rel_center(self, value: Coordinate) -> None: ...
+    def rel_center(self, value: Point) -> None: ...
     @property
     def centerx(self) -> _N: ...
     @centerx.setter