Update to 1.20.6

[UltimatChamp]

Contains work from #215!

TODO

• spruceui -> 5.0.4
  • waiting for https://github.com/LambdAurora/SpruceUI/pull/52 or similar to get updated!
  • The config system works flawlessly when using a local build of the SpruceUI port!

TL;DR

• Updated to 1.20.6! (fixes https://github.com/LambdAurora/LambDynamicLights/issues/216)

• Using Java 21, including the GitHub workflow!

• Updated dependencies!

• • *

For those who can't wait ;) :

• https://github.com/UltimatChamp/LambDynamicLights/actions/runs/9092830965/artifacts/1504349432
• https://github.com/Natan822/SpruceUI/actions/runs/9071154568/artifacts/1499098405 (for mod menu config screen to work)

[TechySC23]

@LambdAurora Please merge this PR quickly and ASAP. WE NEED THE 1.20.6 VERSION ATLEAST

[UltimatChamp]

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