Fixed flake8 compliance on "..." present in the line of the __init__ "function" definition

Author: Alex-S-H-P

torchvision/tv_tensors/_keypoints.py

@@ -72,7 +72,8 @@ def __init__(
             dtype: Optional[torch.dtype] = None,
             device: Optional[Union[torch.device, str, int]] = None,
             requires_grad: Optional[bool] = None,
-        ): ...
+        ):
+            pass
 
     @classmethod
     def _wrap_output(