test: change anonymous closure functions to arrow functions

PR-URL: #24418
Reviewed-By: Ouyang Yadong <oyydoibh@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: oyenamit

test/parallel/test-http-res-write-end-dont-take-array.js

@@ -62,10 +62,10 @@ server.once('request', common.mustCall((req, res) => {
 
 server.listen(0, function() {
   // just make a request, other tests handle responses
-  http.get({ port: this.address().port }, function(res) {
+  http.get({ port: this.address().port }, (res) => {
     res.resume();
     // do it again to test .end(Buffer);
-    http.get({ port: server.address().port }, function(res) {
+    http.get({ port: server.address().port }, (res) => {
       res.resume();
       server.close();
     });