add Color.__bytes__ to the stubs

Author: Matiiss

buildconfig/stubs/pygame/color.pyi

@@ -42,6 +42,7 @@ class Color(Collection[int]):
     def __mod__(self, other: Color) -> Color: ...
     def __int__(self) -> int: ...
     def __float__(self) -> float: ...
+    def __bytes__(self) -> bytes: ...
     def __len__(self) -> int: ...
     def __index__(self) -> int: ...
     def __invert__(self) -> Color: ...