Upgrade black version (#7089)

stdlib/asyncio/futures.pyi

@@ -6,6 +6,7 @@ from .events import AbstractEventLoop
 
 if sys.version_info < (3, 8):
     from concurrent.futures import CancelledError as CancelledError, TimeoutError as TimeoutError
+
     class InvalidStateError(Error): ...
 
 if sys.version_info >= (3, 7):
@@ -48,6 +49,7 @@ class Future(Awaitable[_T], Iterable[_T]):
         def cancel(self, msg: Any | None = ...) -> bool: ...
     else:
         def cancel(self) -> bool: ...
+
     def cancelled(self) -> bool: ...
     def done(self) -> bool: ...
     def result(self) -> _T: ...