Mark ruTorrent v4.3 as Stable

Step 1: Upgrade to the latest super stable hotfix. Changes since v4.3.6 include critical fixes for automatic updating of RSS feeds and deleting torrents without confirmation.

https://github.com/Novik/ruTorrent/releases/tag/v4.3.8

Step 2 (Optional): Sponsor ruTorrent developer with Tomcat slot due to limited time. The purpose is to provide to critical feedback about how to address API breakage concerns from version 3. These include third party plugins like autodl-irssi and file manager.

Step 3: Review configuration and make necessary changes to bring version 3 plugins into the version 4 support scope. This will ensure no functionality is lost from version 3.

Step 4: Update any required documentation and move ruTorrent v4.3 to stable.