inspector: use String from primordials

Author: cola119

lib/internal/inspector_network_tracking.js

@@ -4,6 +4,7 @@ const {
   ArrayIsArray,
   DateNow,
   ObjectEntries,
+  String,
 } = primordials;
 
 let dc;
@@ -18,7 +19,7 @@ const headerObjectToDictionary = (headers = {}) => {
   for (const { 0: key, 1: value } of ObjectEntries(headers)) {
     if (typeof value === 'string') dict[key] = value;
     if (ArrayIsArray(value)) dict[key] = value.join(', ');
-    else dict[key] = value.toString();
+    else dict[key] = String(value);
   }
   return dict;
 };