refactor(typing): update handler signatures to use Dict and Any for improved type hinting

steps/advoware_cal_sync/calendar_sync_event_step.py

@@ -14,6 +14,7 @@ import asyncio
 import os
 import datetime
 from datetime import timedelta
+from typing import Dict, Any
 import pytz
 import backoff
 import time
@@ -945,14 +946,14 @@ config = {
 }
 
 
-async def handler(input_data: dict, ctx: FlowContext):
+async def handler(input_data: Dict[str, Any], ctx: FlowContext) -> None:
     """Main event handler for calendar sync."""
     start_time = time.time()
     
     kuerzel = input_data.get('kuerzel')
     if not kuerzel:
         log_operation('error', "No kuerzel provided in event", context=ctx)
-        return {'status': 400, 'body': {'error': 'No kuerzel provided'}}
+        return
 
     log_operation('info', f"Starting calendar sync for employee {kuerzel}", context=ctx)