[Automated changes] PHP files

Author: github-actions[bot]

php/async/bitget.php

@@ -1420,6 +1420,7 @@ public function describe(): mixed {
                     'spot' => array(
                         '1m' => '1min',
                         '5m' => '5min',
+                        '3m' => '3min',
                         '15m' => '15min',
                         '30m' => '30min',
                         '1h' => '1h',