Refactored adapters loader; (#5277)

Co-authored-by: Jay <jasonsaayman@gmail.com>

package.json

@@ -104,7 +104,7 @@
     "url-search-params": "^0.10.0"
   },
   "browser": {
-    "./lib/adapters/http.js": "./lib/adapters/xhr.js",
+    "./lib/adapters/http.js": "./lib/helpers/null.js",
     "./lib/platform/node/index.js": "./lib/platform/browser/index.js"
   },
   "jsdelivr": "dist/axios.min.js",
@@ -138,4 +138,4 @@
     "Daniel Lopretto (https://github.com/timemachine3030)"
   ],
   "sideEffects": false
-}
+}