Update tts.py

tts.py

@@ -34,5 +34,8 @@ async def _main() -> None:
     await communicate.save(OUTPUT_FILE)
 
 if __name__ == "__main__":
-    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
-    asyncio.run(_main())
+    loop = asyncio.get_event_loop()
+    try:
+        loop.run_until_complete(_main())
+    finally:
+        loop.close()