chore(assets): bump theme version to bust stale admin asset caches

The terms field handlers shipped with the widget parity work, but every
asset is enqueued with the unchanged AKSRT_VERSION cache key, so
browsers kept the old admin.js without them: category checkboxes
toggled visually while chips and the hidden value never synced, and
saved term_id stayed empty (widget renders nothing). Bump the version
so all theme assets re-fetch.

functions.php

@@ -16,7 +16,7 @@
 
 defined('ABSPATH') || exit;
 
-define('AKSRT_VERSION', '3.4.0-dev');
+define('AKSRT_VERSION', '3.4.1-dev');
 define('AKSRT_DIR', get_template_directory());
 define('AKSRT_URI', get_template_directory_uri());