WordPress - Disable Plugin Update Notification For A Specific WordPress Plugin

functions.php

/* Put this code in current theme’s functions.php */
/* Replace plugin-directory/plugin-file.php with plugin’s directory and file name */

function filter_plugin_updates( $value ) {
    unset( $value->response['plugin-directory/plugin-file.php'] );
    return $value;
}
add_filter( 'site_transient_update_plugins', 'filter_plugin_updates' );