`tree-sitter generate` fails with "error: repetition quantifier expects a valid decimal"

[miriti]

Hi!

Maybe I'm doing something wrong here. Just cloned the latest version of tree-sitter-haxe (93c3ce595e41727670f7c0e6c88afe16b5384f0d). cd into the cloned directory and ran tree-sitter generate (tree-sitter version 0.22.2). It fails with this output:

Error processing rule escape_sequence

Caused by:
    regex parse error:
        u{[0-9a-fA-F]+}
          ^
    error: repetition quantifier expects a valid decimal