For example if you don't want WordPress to show update notifications for Akismet, you will do it like this:
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function filter_plugin_updates( $value ) {
unset( $value->response['akismet/akismet.php'] );
return $value;
}
add_filter( 'site_transient_update_plugins', 'filter_plugin_updates' );
Now, Add these codes to your activated theme - function.php