fix(loaders): correct random checkpoint loader return type annotation

load_checkpoint returns a 4-tuple (MODEL, CLIP, VAE, model_name) since the
random loader exposes the selected model name; the annotation still claimed
a 3-tuple.

py/nodes/random_checkpoint_loader.py

@@ -171,7 +171,7 @@ class RandomCheckpointLoaderLM:
         ckpt_name: str,
         select_at_random: bool = False,
         base_model: str = "Any",
-    ) -> Tuple[Any, Any, Any]:
+    ) -> Tuple[Any, Any, Any, str]:
         """Load a checkpoint by name, supporting extra folder paths
 
         Args: