chore: Bump Julia grammar

[jcs090218]

For #288.

[jcs090218]

It seems like there is an compile error. 🤔

Error processing rule _word_identifier
Details:
  Regex error: Binary operators in character classes aren't supported

https://github.com/emacs-tree-sitter/tree-sitter-langs/actions/runs/7136511070/job/19435052813?pr=289#step:9:3686

[linwaytin]

Is it possible that this error is related to the tree-sitter version?

I have another machine on which I can use the built-in treesit package in Emacs 29. The julia grammar can be compiled and installed without problems. I have tree-sitter 0.20.10 on that machine.

[jcs090218]

We are currently sticking to version 0.19.3 due to the storage location. See https://github.com/emacs-tree-sitter/tree-sitter-langs?tab=readme-ov-file#tools-and-dependencies.