url: use foreach-style C++ loop

PR-URL: #23138
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

src/node_url.h

@@ -159,9 +159,8 @@ class URL {
 
   std::string path() const {
     std::string ret;
-    for (auto i = context_.path.begin(); i != context_.path.end(); i++) {
-      ret += '/';
-      ret += *i;
+    for (const std::string& element : context_.path) {
+      ret += '/' + element;
     }
     return ret;
   }