Compile test fix (#6104)

* update

* update

Author: DN6

src/diffusers/utils/testing_utils.py

@@ -820,7 +820,9 @@ def _is_torch_fp16_available(device):
 
     try:
         x = torch.zeros((2, 2), dtype=torch.float16).to(device)
-        _ = x @ x
+        _ = torch.mul(x, x)
+        return True
+
     except Exception as e:
         if device.type == "cuda":
             raise ValueError(
@@ -838,7 +840,9 @@ def _is_torch_fp64_available(device):
 
     try:
         x = torch.zeros((2, 2), dtype=torch.float64).to(device)
-        _ = x @ x
+        _ = torch.mul(x, x)
+        return True
+
     except Exception as e:
         if device.type == "cuda":
             raise ValueError(