chore(client): use anyio.sleep instead of asyncio.sleep (anthropics#351)

Author: stainless-bot

src/anthropic/_resource.py

@@ -3,7 +3,8 @@
 from __future__ import annotations
 
 import time
-import asyncio
+
+import anyio
 
 from ._base_client import SyncAPIClient, AsyncAPIClient
 
@@ -37,4 +38,4 @@ def __init__(self, client: AsyncAPIClient) -> None:
         self._get_api_list = client.get_api_list
 
     async def _sleep(self, seconds: float) -> None:
-        await asyncio.sleep(seconds)
+        await anyio.sleep(seconds)