Update to Minecraft 1.21.5

This is a first release for Minecraft 1.21.5, targeting 1.21.5-rc1. This version is currently unstable, and should only be used for early porting.

• Updated to Minecraft 1.21.5
• Removed all deprecated APIs, including the EnvironmentController, TemperatureConverter, and some methods of ConfiguredTemperatureEffect, and TemperatureEffects.
• Temporarily disabled gametests so that they can be rewritten at a later date
• The EnvironmentCommand and TemperatureCommand classes were made final and now have a private constructor. Other static-only classes like this will receive similar treatment soon.