fix(update): v2.7.1 avoid transient Nginx 502 error during 1-click web update

public/api.php

@@ -2621,6 +2621,7 @@ try {
             break;
 
         case 'run_update':
+            @set_time_limit(300);
             $output = [];
             $code = 0;
             exec("sudo /var/www/nexus-pbx/scripts/update.sh 2>&1", $output, $code);