Syntax highlighting does not work for Scilab (.sci) files

Summary

Syntax highlighting does not work for Scilab (.sci) files although highlight.js supports it

Example Project

Just try to view a Scilab file in a GitLab project, e.g.

https://gitlab.com/scilab/scilab/-/blob/6.1/scilab/modules/cacsd/macros/abcd.sci

mottelet/scilab$2424510

What is the current bug behavior?

No syntax highlighting of code in source tree or snippets

What is the expected correct behavior?

Highlighted code like in the "Scilab" paragraph of https://highlightjs.org/static/demo/#scientific