refactor(api): continue decoupling dify_graph from API concerns (#33580)

Signed-off-by: -LAN- <laipz8200@outlook.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: WH-2099 <wh2099@pm.me>

api/libs/datetime_utils.py

@@ -2,7 +2,7 @@ import abc
 import datetime
 from typing import Protocol
 
-import pytz
+import pytz  # type: ignore[import-untyped]
 
 
 class _NowFunction(Protocol):

api/libs/schedule_utils.py

@@ -1,6 +1,6 @@
 from datetime import UTC, datetime
 
-import pytz
+import pytz  # type: ignore[import-untyped]
 from croniter import croniter