Update package for tree-sitter 0.21

[kamoshi]

Tree-sitter 0.21 was recently released and this package needs to be updated in order to work with the new version of tree-sitter.

[tek]

I just regenerated with 0.22. crate upload has failed, though I think it hadn't worked before.

[kamoshi]

Thanks for the update!

I have no experience with automated crate uploads, but it seems like it might be caused by this rust-lang/cargo#12828

[tek]

huh!