バージョンを4.4.0に更新

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

Author: nobuhiko

composer.json

@@ -1,6 +1,6 @@
 {
     "name": "ec-cube/datamigration43",
-    "version": "4.3.7",
+    "version": "4.4.0",
     "description": "データ移行プラグイン",
     "type": "eccube-plugin",
     "require": {