Simplify overloads

Co-authored-by: Alex Waygood <[email protected]>

Author: Gobot1234

stdlib/builtins.pyi

@@ -906,14 +906,12 @@ class _Falsy(Protocol):
 
 @final
 class bool(int):
-    @overload
-    def __new__(cls) -> Literal[False]: ...
     @overload
     def __new__(cls, __o: _Truthy) -> Literal[True]: ...
     @overload
-    def __new__(cls, __o: _Falsy) -> Literal[False]: ...
+    def __new__(cls, __o: _Falsy = ...) -> Literal[False]: ...
     @overload
-    def __new__(cls, __o: object = ...) -> Self: ...
+    def __new__(cls, __o: object) -> Self: ...
     # The following overloads could be represented more elegantly with a TypeVar("_B", bool, int),
     # however mypy has a bug regarding TypeVar constraints (https://github.com/python/mypy/issues/11880).
     @overload