fix: disallow $ from identifiers

query.c does not allow these characters in identifiers, unlike in JS
identifiers. Parser generated with 0.25.6.

Author: ribru17

grammar.js

@@ -11,7 +11,7 @@ const PREC = {
 };
 
 // Identifiers cannot start with `.`
-const IDENTIFIER = /[a-zA-Z0-9\-_\$][a-zA-Z0-9.\-_\$]*/;
+const IDENTIFIER = /[a-zA-Z0-9\-_][a-zA-Z0-9.\-_]*/;
 
 module.exports = grammar({
   name: "query",