fix(examples): correct import order in Gemini example

- Move `CartesiaMultiLingualTTSService` import to maintain proper order.
- Reorganize `enum` import to adhere to styling standards.

src/pipecat/services/gemini_multimodal_live/gemini.py

@@ -6,9 +6,9 @@
 
 import asyncio
 import base64
-from enum import Enum
 import json
 from dataclasses import dataclass
+from enum import Enum
 from typing import Any, Dict, List, Optional
 
 import websockets