lib: convert to Arrow Function

convert to Arrow Function and test by `./tools/test.py tick-processor`
PR-URL: #24615
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Masashi Hirano <shisama07@gmail.com>

Author: Daiki Arai

lib/internal/v8_prof_processor.js

@@ -18,7 +18,7 @@ const scriptFiles = [
 ];
 var script = '';
 
-scriptFiles.forEach(function(s) {
+scriptFiles.forEach((s) => {
   script += internalBinding('natives')[s] + '\n';
 });