Add keyword raw (#585)

Append the keywords list to Include the raw borrow operator,
stabilized in Rust 2024.

https://doc.rust-lang.org/reference/expressions/operator-expr.html#raw-borrow-operators

Author: skr4n

rust-prog-mode.el

@@ -188,7 +188,7 @@ See `prettify-symbols-compose-predicate'."
     "let" "loop"
     "match" "mod" "move" "mut"
     "priv" "pub"
-    "ref" "return"
+    "raw" "ref" "return"
     "self" "static" "struct" "super"
     "true" "trait" "type" "try"
     "use"