I resolved an IndentationError in the create_lower_mouth_mask function
in modules/processors/frame/face_swapper.py by correcting the
indentation of the lower_lip_order list definition and the subsequent
try-except block.
Additionally, I updated the function's return type hint to use
typing.Tuple and typing.Optional for Python 3.9+ compatibility.
This fixes a crash that prevented your application from running.