fix pyink issue

Author: lwangverizon

src/google/adk/sessions/database_session_service.py

@@ -313,12 +313,12 @@ async def get_session(
       )
       if storage_session is None:
         session = await self.create_session(
-          app_name=app_name,
-          user_id=user_id,
-          session_id=session_id,
+            app_name=app_name,
+            user_id=user_id,
+            session_id=session_id,
         )
         return session
-      
+
       stmt = (
           select(schema.StorageEvent)
           .filter(schema.StorageEvent.app_name == app_name)
@@ -356,7 +356,7 @@ async def get_session(
       # Convert storage session to session
       events = [e.to_event() for e in reversed(storage_events)]
       session = storage_session.to_session(state=merged_state, events=events)
-    return session
+      return session
 
   @override
   async def list_sessions(
@@ -441,8 +441,8 @@ async def append_event(self, session: Session, event: Event) -> Event:
       if storage_session.update_timestamp_tz > session.last_update_time:
         raise ValueError(
             "The last_update_time provided in the session object"
-            f" {datetime.fromtimestamp(session.last_update_time):'%Y-%m-%d %H:%M:%S'} is"
-            " earlier than the update_time in the storage_session"
+            f" {datetime.fromtimestamp(session.last_update_time):'%Y-%m-%d %H:%M:%S'}"
+            " is earlier than the update_time in the storage_session"
             f" {datetime.fromtimestamp(storage_session.update_timestamp_tz):'%Y-%m-%d %H:%M:%S'}."
             " Please check if it is a stale session."
         )