Annotate supersets

Author: srittau

stubs/assertpy/assertpy/collection.pyi

@@ -10,7 +10,7 @@ _V = TypeVar("_V", default=Any)
 class CollectionMixin(Generic[_V]):
     def is_iterable(self) -> Self: ...
     def is_not_iterable(self) -> Self: ...
-    def is_subset_of(self, *supersets) -> Self: ...
+    def is_subset_of(self, *supersets: _V) -> Self: ...
     @overload
     def is_sorted(self, key: Callable[[_V], SupportsRichComparison] = ..., reverse: Literal[False] = False) -> Self: ...
     @overload