Change 'no set_normalizer' logger info to warning

src/ptbench/scripts/train.py

@@ -259,7 +259,7 @@ def train(
     if hasattr(model, "set_normalizer"):
         model.set_normalizer(datamodule.train_dataloader())
     else:
-        logger.info(
+        logger.warning(
             f"Model {model.name} has no 'set_normalizer' method. No normalization will be applied."
         )