fix: fix mypy errors in api_fastapi/logging/ (apache#57096)

Author: kevinhongzl

airflow-core/src/airflow/api_fastapi/logging/decorators.py

@@ -19,6 +19,7 @@
 import itertools
 import json
 import logging
+from datetime import datetime
 
 import pendulum
 from fastapi import Request
@@ -157,7 +158,10 @@ async def log_action(
             logical_date_value = request.query_params.get("logical_date")
             if logical_date_value:
                 try:
-                    log.logical_date = pendulum.parse(logical_date_value, strict=False)
+                    logical_date = pendulum.parse(logical_date_value, strict=False)
+                    if not isinstance(logical_date, datetime):
+                        raise ParserError
+                    log.logical_date = logical_date
                 except ParserError:
                     logger.exception("Failed to parse logical_date from the request: %s", logical_date_value)
             else: