Fixed tensor copy to remove UserWarning (#476)

Co-authored-by: Nishant Prabhu <nishant.p@perfios.com>
Co-authored-by: Nicki Skafte <skaftenicki@gmail.com>

torchmetrics/functional/classification/precision_recall_curve.py

@@ -153,7 +153,7 @@ def _precision_recall_curve_compute_single_class(
 
  recall = torch.cat([reversed(recall[sl]), torch.zeros(1, dtype=recall.dtype, device=recall.device)])
 
- thresholds = tensor(reversed(thresholds[sl]))
+ thresholds = reversed(thresholds[sl]).detach().clone() # type: ignore
 
  return precision, recall, thresholds