update superagent to version 5.1.0

Author: Crhistian Ramirez

package.json

@@ -20,7 +20,7 @@
     "url": "https://github.com/ordercloud-api/OrderCloud-JavaScript-SDK"
   },
   "dependencies": {
-    "superagent": "3.8.2"
+    "superagent": "5.1.0"
   },
   "devDependencies": {
     "bowserify": "^10.2.1",