src: slightly simplify URLHost::ToString

PR-URL: #41747
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Mary Marchini <oss@mmarchini.me>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node_url.cc

@@ -582,9 +582,7 @@ std::string URLHost::ToString() const {
       dest.reserve(15);
       uint32_t value = value_.ipv4;
       for (int n = 0; n < 4; n++) {
-        char buf[4];
-        snprintf(buf, sizeof(buf), "%d", value % 256);
-        dest.insert(0, buf);
+        dest.insert(0, std::to_string(value % 256));
         if (n < 3)
           dest.insert(0, 1, '.');
         value /= 256;