Adding the following code into the functions.php file of your active WordPress theme, it will simply remove update notifications for all your installed plugins. This could be helpful if you are creating a WordPress website for a client, and do not want them to update their plugins.

remove_action( 'load-update-core.php', 'wp_update_plugins' );
add_filter( 'pre_site_transient_update_plugins', '__return_null' );
wp_clear_scheduled_hook( 'wp_update_plugins' );

Now you will not see WP plugin update notifications like this.