Hide update nag on child websites

Hello team,

I use MainWP for managing client websites. Now WordPress 5.7 is available and a message show on the wp-admin.
How can I hide this message?
I use this code snippet, to add these lines to the

wp-config

via Code Snippets Extension:
define(‘DISALLOW_FILE_EDIT’,true); // theme, plugin
define(‘DISALLOW_FILE_MODS’,true); // core, plugin

Is there a line I can add to

this

snippet?

Thanks!

Best Tom