Fixed mutable default issue in is_hydration_needed (#836)

Author: jamesbraza

paperqa/types.py

@@ -665,7 +665,7 @@ def source_quality_message(self) -> str:
     def is_hydration_needed(
         self,
         exclusion: Collection[str] = OPTIONAL_HYDRATION_FIELDS,
-        inclusion: Collection[str] = [],
+        inclusion: Collection[str] = (),
     ) -> bool:
         """Determine if we have unfilled attributes."""
         if inclusion: