fix content type error

db/audio_db/is3/wrapper.py

@@ -32,7 +32,7 @@ async def get_tokens():
                 'grant_type': 'refresh_token',
             }
         )
-    r = await r.json()
+    r = await r.json(content_type='application/json')
     return r['access_token'], r['refresh_token']
 
 ACCESS_TOKEN, REFRESH_TOKEN = asyncio.run(get_tokens())