refactor(trigger): remove unnecessary whitespace in trigger-related files

- Cleaned up the code by removing extraneous whitespace in `trigger.py` and `workflow_plugin_trigger_service.py`, improving readability and maintaining code style consistency.

api/services/trigger/workflow_plugin_trigger_service.py

@@ -1,4 +1,3 @@
-
 from pydantic import BaseModel
 from sqlalchemy import select
 from sqlalchemy.orm import Session