[libs.common.data.datamodule] Fix typing errors

src/mednet/libs/common/data/datamodule.py

@@ -510,7 +510,10 @@ class ConcatDataModule(lightning.LightningDataModule):
     @model_transforms.setter
     def model_transforms(self, value: list[Transform] | None):
         old_value = self._model_transforms
-        self._model_transforms = value
+        if value is None:
+            self._model_transforms = value
+        else:
+            self._model_transforms = list(value)
 
         # datasets that have been setup() for the current stage are reset
         if value != old_value and len(self._datasets):