Can’t upgrade WP 5.6 to 5.6.1: version-current.php is missing

Fast and easy solution would be to update manually. Download the wordpress package from wordpress.org and unpack to your server.
https://wordpress.org/support/article/updating-wordpress/#manual-update

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)