Is your feature request related to a problem? Please describe.
Important mods are using this library, so update is needed.

Describe the solution you'd like
Please update it for 1.21.10

Describe alternatives you've considered
No alternative.

I'll discontinue this library, I have other things to worry about.
I recommend using this in the future:
https://github.com/ZigyTheBird/PlayerAnimationLibrary

https://docs.zigythebird.com/pal/how_to_port_from_player_animator/