Upgrade black version (#7089)

stdlib/asyncio/streams.pyi

@@ -12,6 +12,7 @@ if sys.version_info < (3, 8):
         expected: int | None
         partial: bytes
         def __init__(self, partial: bytes, expected: int | None) -> None: ...
+
     class LimitOverrunError(Exception):
         consumed: int
         def __init__(self, message: str, consumed: int) -> None: ...
@@ -114,6 +115,7 @@ class StreamWriter:
     if sys.version_info >= (3, 7):
         def is_closing(self) -> bool: ...
         async def wait_closed(self) -> None: ...
+
     def get_extra_info(self, name: str, default: Any = ...) -> Any: ...
     async def drain(self) -> None: ...