Relax isdisjoint method to accept Iterable[object]

Related to #15271.

This prevents false positives, and it is anyhow a better match for what the runtime accepts.

Author: Sachaa-Thanasius

stdlib/builtins.pyi

@@ -1303,7 +1303,7 @@ class frozenset(AbstractSet[_T_co]):
     def copy(self) -> frozenset[_T_co]: ...
     def difference(self, *s: Iterable[object]) -> frozenset[_T_co]: ...
     def intersection(self, *s: Iterable[object]) -> frozenset[_T_co]: ...
-    def isdisjoint(self, s: Iterable[_T_co], /) -> bool: ...
+    def isdisjoint(self, s: Iterable[object], /) -> bool: ...
     def issubset(self, s: Iterable[object], /) -> bool: ...
     def issuperset(self, s: Iterable[object], /) -> bool: ...
     def symmetric_difference(self, s: Iterable[_T_co], /) -> frozenset[_T_co]: ...