fix(core): add missing fast-xml-parser dependency (#5869)

Author: kuhe

packages/core/package.json

@@ -30,6 +30,7 @@
     "@smithy/signature-v4": "^2.1.3",
     "@smithy/smithy-client": "^2.4.2",
     "@smithy/types": "^2.10.1",
+    "fast-xml-parser": "4.2.5",
     "tslib": "^2.5.0"
   },
   "devDependencies": {