fix whitespace

Author: joratz

libraries/microsoft-agents-a365-notifications/microsoft_agents_a365/notifications/agent_notification.py

@@ -180,4 +180,4 @@ def _normalize_lifecycleevent(value: str | AgentLifecycleEvent | None) -> str:
         if value is None:
             return ""
         resolved = value.value if isinstance(value, AgentLifecycleEvent) else str(value)
-        return resolved.lower().strip()
+        return resolved.lower().strip()