builtins: Fix unconstrained overloads in set() and frozenset()

See microsoft/pyright#3501 (comment)

Related to #7928

stdlib/builtins.pyi

@@ -909,7 +909,7 @@ class list(MutableSequence[_T], Generic[_T]):
 class dict(MutableMapping[_KT, _VT], Generic[_KT, _VT]):
     # __init__ should be kept roughly in line with `collections.UserDict.__init__`, which has similar semantics
     @overload
-    def __init__(self: dict[_KT, _VT]) -> None: ...
+    def __init__(self) -> None: ...
     @overload
     def __init__(self: dict[str, _VT], **kwargs: _VT) -> None: ...
     @overload
@@ -962,6 +962,9 @@ class dict(MutableMapping[_KT, _VT], Generic[_KT, _VT]):
         def __ior__(self: Self, __value: Iterable[tuple[_KT, _VT]]) -> Self: ...
 
 class set(MutableSet[_T], Generic[_T]):
+    @overload
+    def __init__(self) -> None: ...
+    @overload
     def __init__(self, __iterable: Iterable[_T] = ...) -> None: ...
     def add(self, __element: _T) -> None: ...
     def copy(self) -> set[_T]: ...
@@ -998,6 +1001,9 @@ class set(MutableSet[_T], Generic[_T]):
         def __class_getitem__(cls, __item: Any) -> GenericAlias: ...
 
 class frozenset(AbstractSet[_T_co], Generic[_T_co]):
+    @overload
+    def __init__(self) -> None: ...
+    @overload
     def __init__(self, __iterable: Iterable[_T_co] = ...) -> None: ...
     def copy(self) -> frozenset[_T_co]: ...
     def difference(self, *s: Iterable[object]) -> frozenset[_T_co]: ...