Fix ModuleNotFoundError: No module named 'distutils' in ios_boostrap.py (#30803)

Use vpython3 which still has distutils available

DEPS

@@ -60,7 +60,7 @@ hooks = [
     'name': 'bootstrap_ios',
     'pattern': '.',
     'condition': 'checkout_ios and host_os == "mac"',
-    'action': ['python3', 'script/ios_bootstrap.py']
+    'action': ['vpython3', 'script/ios_bootstrap.py']
   },
   {
     # Download hermetic xcode for goma

script/ios_bootstrap.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env vpython3
 # Copyright (c) 2024 The Brave Authors. All rights reserved.
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this file,