Fix: yolo8 loading issue.

app.py

@@ -45,7 +45,7 @@ def load_yolo_model(version="yolov5"):
     if version == "yolov5":
         model = torch.hub.load('ultralytics/yolov5', 'yolov5s', pretrained=True)
     elif version == "yolov8":
-        model = torch.hub.load('ultralytics/yolov5:v7.0', 'yolov5', pretrained=True)  # YOLOv8 is part of the yolov5 repo starting from v7.0
+        model = torch.hub.load('ultralytics/yolov8', 'yolov8s', pretrained=True)  # YOLOv8 is part of the yolov5 repo starting from v7.0
     elif version == "yolov10":
         model = torch.hub.load('ultralytics/yolov5', 'yolov5m', pretrained=True)  # Placeholder for YOLOv10 (use an appropriate version if available)
     else: