fix: wrong return type annotation in resampling() function

kimi_k25_vision_processing.py

@@ -27,7 +27,7 @@ def resampling(video_bytes: bytes,
                sample_indices: list[int],
                key_indices=None,
                frame_time_info=None,
-               num_threads=4) -> str:
+               num_threads=4) -> list[Image.Image]:
     video = VideoReader(video_bytes,
                         num_threads=num_threads,
                         frame_time_info=frame_time_info,