Port to 1.21-pre4 (#283)
* Port to 1.21-pre4
Update dependencies to 1.21-pre4. Note that PlayerAbilityLib requires a
not yet accepted PR
(https://github.com/Ladysnake/PlayerAbilityLib/pull/24). This was tested
using a local build of pal.
Adapt to new function signatures for mixins.
* switch to official PlayerAbilityLib release for 1.21
---------
Co-authored-by: Peter Svensson <petersv@psv.nu>
Co-authored-by: John Paul <jp@jpcode.dev>
