The function is hooked to an action, so you should be able to remove it.
remove_action('admin_notices','default_password_nag');
You can then add back a function of your own choosing. Rename your function to something that won’t conflict with the Core function name and…
add_action('admin_notices','my_password_nag');
You will need to create a plugin or mu-plugin to do it, but those are relatively easy to create.
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