Update model_index.json

model_index.json

@@ -5,7 +5,7 @@
     {
       "model_type": "UNet2DModel",
       "config": "config.json",
-      "weight": "diffusion_pytorch_model.safetensors"
+      "weights": "diffusion_pytorch_model.safetensors"
     }
   ]
 }