[Youku] fix extractor to use latest ccode

[peroperosauce]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2021.03.14
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

ERROR: Youku server reported error -6004: 客户端无权播放,201; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Description

In youku.py, as of today 2021.03.16, the currently hard-coded ccode 0590 :
https://github.com/ytdl-org/youtube-dl/blob/master/youtube_dl/extractor/youku.py#L157

does not work anymore and leads to the following error when trying to download any youku video :
ERROR: Youku server reported error -6004: 客户端无权播放,201

The new ccode to use since march 2021 is 0532.
Can you please update youky.py in order to replace 0590 by 0532 ?

I asked the question in #28447 but maybe an issue "Broken site support" is more suitable ?
Thanks

[W-Leviosa]

Hello, I am using mac OS, can anyone help with where should I change this code? I don't know how to find the youku.py file.