bump version (WP-991)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: vsolovei-smartling

smartling-connector.php

@@ -11,7 +11,7 @@
  * Plugin Name:       Smartling Connector
  * Plugin URI:        https://www.smartling.com/products/automate/integrations/wordpress/
  * Description:       Integrate your WordPress site with Smartling to upload your content and download translations.
- * Version:           5.4.0
+ * Version:           5.5.0
  * Author:            Smartling
  * Author URI:        https://www.smartling.com
  * License:           GPL-2.0+