Plugins PyroMining [1.14.X - 1.21.X] [v4.0.0 Update! Artifacts, Fossils and Vessels!]

This update requires PyroLib v1.4.3 or higher to run.

Additions:
- Added 1.21 support to the plugin. (majority of it should work on 1.21 already).
- Added some backend support for the v5 upgrade for when it happens.

General Changes:
- Bumped PyroLib requirement to v1.4.3. (this will be required for v5 regardless)
- Reduced the difficulty of Rune Guardians.

Fixes:
- Fixed an issue where Rune Guardians would duplicate instead of dying.
- Fixed Vessel Health causing issues and errors if it exceeded the default amount in the Spigot config.
- Fixed a player-caused crash exploit on 1.21.

Note: v5 is expected around the 24th of August.