Fix remaining type checking issues

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/memory/entity/entity_memory.py

@@ -65,8 +65,8 @@ class EntityMemory(Memory):
     def save(
         self,
         value: Any,
-        metadata: Dict[str, Any] = None,
-        agent: str = None,
+        metadata: Optional[Dict[str, Any]] = None,
+        agent: Optional[str] = None,
     ) -> None:
         """Saves an entity item or value into the storage."""
         if isinstance(value, EntityMemoryItem):

src/crewai/memory/long_term/long_term_memory.py

@@ -54,8 +54,8 @@ class LongTermMemory(Memory):
     def save(
         self,
         value: Any,
-        metadata: Dict[str, Any] = None,
-        agent: str = None,
+        metadata: Optional[Dict[str, Any]] = None,
+        agent: Optional[str] = None,
     ) -> None:
         """Saves a value into the memory."""
         if isinstance(value, LongTermMemoryItem):