fix: add missing await to table check (#5977)

fix: make table check method async in database service

src/backend/base/langflow/services/database/service.py

@@ -364,7 +364,7 @@ async def run_migrations_test(self):
         ]
         async with self.with_session() as session, session.bind.connect() as conn:
             return [
-                TableResults(sql_model.__tablename__, conn.run_sync(self.check_table, sql_model))
+                TableResults(sql_model.__tablename__, await conn.run_sync(self.check_table, sql_model))
                 for sql_model in sql_models
             ]