fix: Correct logging method from warning to warn for lock acquisition in AI Knowledge sync handler

steps/vmh/aiknowledge_sync_event_step.py

@@ -55,7 +55,7 @@ async def handler(event_data: Dict[str, Any], ctx: FlowContext[Any]) -> None:
     lock_acquired = await sync_utils.acquire_sync_lock(knowledge_id)
     
     if not lock_acquired:
-        ctx.logger.warning(f"⏸️  Lock already held for {knowledge_id}, skipping")
+        ctx.logger.warn(f"⏸️  Lock already held for {knowledge_id}, skipping")
         ctx.logger.info("   (Will be retried by Motia queue)")
         raise RuntimeError(f"Lock busy for {knowledge_id}")  # Motia will retry