release v4.0.5

[topi314]

• Updated Lavaplayer to 2.1.2
• Updated Koe to 2.0.1 (fixes the IndexOutOfBoundsException when playing a YouTube track)
• Added option to enable Nico source
• Expose Lavalink sessions to plugins via the ISocketServer interface

[!WARNING] The default Youtube source is now deprecated and won't receive further updates. Please use https://github.com/lavalink-devs/youtube-source#plugin instead.