Initial port to 1.21.8.

The following mods were updated:

• C2ME: 0.3.4+rc.1.0+1.21.8
• Distant Horizons: 2.3.4-b-1.21.8
• Fabric API: 0.129.0+1.21.8
• Lithium: mc1.21.8-0.18.0-fabric

Disclaimer: Noisium still hasn't updated to 1.21.7/8, so dependency override is still here.