W-21432256: update isomorhpic version to 5.1.0

Author: amittapalli

packages/commerce-sdk-react/package-lock.json

@@ -40,7 +40,7 @@
     "version": "node ./scripts/version.js"
   },
   "dependencies": {
-    "commerce-sdk-isomorphic": "5.1.0-unstable-20260226081656",
+    "commerce-sdk-isomorphic": "5.1.0",
     "js-cookie": "^3.0.1",
     "jwt-decode": "^4.0.0"
   },