Fix async client timeout (#1617)

# What does this PR do?

Fixes #1616

According to the [aiohttp.ClientTimeout
docs](https://docs.aiohttp.org/en/stable/client_reference.html#aiohttp.ClientTimeout),
the arguments should be in seconds. This PR removes the multiplication
by 60.

@OlivierDehaene OR @Narsil

clients/python/text_generation/client.py

@@ -424,7 +424,7 @@ class AsyncClient:
         self.base_url = base_url
         self.headers = headers
         self.cookies = cookies
-        self.timeout = ClientTimeout(timeout * 60)
+        self.timeout = ClientTimeout(timeout)
 
     async def chat(
         self,