Fix several new-in-3.11 stubtest errors (#7973)

stdlib/fractions.pyi

@@ -1,9 +1,10 @@
 import sys
 from _typeshed import Self
+from collections.abc import Callable
 from decimal import Decimal
 from numbers import Integral, Rational, Real
 from typing import Any, overload
-from typing_extensions import Literal, TypeAlias
+from typing_extensions import Literal, SupportsIndex, TypeAlias
 
 _ComparableNum: TypeAlias = int | float | Decimal | Real
 
@@ -141,7 +142,7 @@ class Fraction(Rational):
     def __copy__(self: Self) -> Self: ...
     def __deepcopy__(self: Self, memo: Any) -> Self: ...
     if sys.version_info >= (3, 11):
-        def __int__(self) -> int: ...
+        def __int__(self, _index: Callable[[SupportsIndex], int] = ...) -> int: ...
     # Not actually defined within fractions.py, but provides more useful
     # overrides
     @property