fix Unicode.julia_chartransform for Julia 1.10 (#52027)
#49559 by @JeffBezanson updated `src/flisp/julia_charmap.h` but missed
[the
comment](https://github.com/JuliaLang/julia/blob/164969f3d06919b073f3aa9ee608e40974ca82d9/src/flisp/julia_charmap.h#L5-L6)
noting that `base/strings/unicode.jl` has to be updated accordingly.
