v5.4.1 - Minecraft 1.21.1 Support

Hello everyone!
This version adds support for 1.21.1 and some backwards compability for 1.17.
To achieve backwards compability, I had to downgrade the database dependency. Therefore it is crucial to backup your data in case things don't work out as planned. On my testing systems, no issues occurred but you'll never know.

BACKUP YOUR DATA BEFORE UPDATING!

Cheers!

Full Changelog: v5.4.0...v5.4.1