chore: Bump ocaml grammar (#372)

* chore: Bump ocaml grammar

* Update highlights.scm

---------

Co-authored-by: jcs090218 <[email protected]>
Co-authored-by: Jen-Chieh Shen <[email protected]>

Author: github-actions[bot]

queries/ocaml/highlights.scm

@@ -42,11 +42,11 @@
 
 (infix_expression
   left: (value_path (value_name) @function)
-  (infix_operator) @operator
+  operator: (concat_operator) @operator
   (#eq? @operator "@@"))
 
 (infix_expression
-  (infix_operator) @operator
+  operator: (rel_operator) @operator
   right: (value_path (value_name) @function)
   (#eq? @operator "|>"))
 
@@ -85,22 +85,26 @@
 
 (match_expression (match_operator) @keyword)
 
-(value_definition [(let_operator) (and_operator)] @keyword)
+(value_definition [(let_operator) (let_and_operator)] @keyword)
 
 [
   (prefix_operator)
   (sign_operator)
-  (infix_operator)
+  (pow_operator)
+  (mult_operator)
+  (add_operator)
+  (concat_operator)
+  (rel_operator)
+  (and_operator)
+  (or_operator)
+  (assign_operator)
   (hash_operator)
   (indexing_operator)
   (let_operator)
-  (and_operator)
+  (let_and_operator)
   (match_operator)
 ] @operator
 
-(infix_operator ["&" "+" "-" "=" ">" "|" "%"] @operator)
-(signed_number ["+" "-"] @operator)
-
 ["*" "#" "::" "<-"] @operator
 
 ; Keywords