update xdebug ref to version 3.4.4

Author: llaville

data/reference/extension/xdebug/3/releases.json

@@ -196,5 +196,11 @@
         "rel_date": "2025-05-14",
         "rel_state": "stable",
         "php_min": "8.0.0"
+    },
+    {
+        "rel_version": "3.4.4",
+        "rel_date": "2025-06-12",
+        "rel_state": "stable",
+        "php_min": "8.0.0"
     }
 ]