I found this 2 filters to add in my functions.php of the Theme:
add_filter( ‘auto_update_plugin’, ‘__return_false’ );
add_filter( ‘auto_update_theme’, ‘__return_false’ );
But I need to do totally block the updates this to multiple WP sites. So I thought to build a plugin that I install where I need instead go every time to change function.php. But is possible to do that with the plugin?