rust: Add `raw` to keyword list for syntax highlighting (#25342)

Marshall Bowers and everdrone created 

This PR adds support for syntax highlighting the `raw` keyword in Rust.

Release Notes:

- Added `raw` keyword to Rust language highlights (see the [Rust 1.82.0
announcement](https://blog.rust-lang.org/2024/10/17/Rust-1.82.0.html#native-syntax-for-creating-a-raw-pointer)).

Co-authored-by: everdrone <giorgiotropiano@gmail.com>

Change summary

crates/languages/src/rust/highlights.scm | 1 +
1 file changed, 1 insertion(+)

Detailed changes