Add second generic parameter for view for DynamicItem

discord/ui/dynamic.py

@@ -39,11 +39,14 @@ if TYPE_CHECKING:
     from ..components import Component
     from ..enums import ComponentType
     from .view import View, LayoutView
+
+    V = TypeVar('V', bound=Union[View, LayoutView], covariant=True, default=Union[View, LayoutView])
 else:
     View = LayoutView = Any
+    from .item import V
 
 
-class DynamicItem(Generic[BaseT], Item[Union[View, LayoutView]]):
+class DynamicItem(Generic[BaseT, V], Item[V]):
     """Represents an item with a dynamic ``custom_id`` that can be used to store state within
     that ``custom_id``.