Update to Composer 2 (#12263)

* Update to Composer 2

No need to roll our own checks anymore since this is now built in.
Also limit the update check to once a week.

* update

* Make Composer wrapper report correct exit code

* Update composer_wrapper.php

* re-enable extension check

Co-authored-by: Tony Murray <murraytony@gmail.com>

artisan

@@ -1,6 +1,8 @@
 #!/usr/bin/env php
 <?php
 
+define('LARAVEL_START', microtime(true));
+
 /*
 |--------------------------------------------------------------------------
 | Register The Auto Loader
@@ -13,7 +15,7 @@
 |
 */
 
-require __DIR__.'/bootstrap/autoload.php';
+require __DIR__.'/vendor/autoload.php';
 
 $app = require_once __DIR__.'/bootstrap/app.php';