Fix error when response is missing included

This fixes the following error when the response from the server does
not have the `included` key:

TypeError: Cannot read properties of undefined (reading 'included')

When missing, the value already defaults to an empty array so this
should be safe when it's "undefined" as well.

dist/alchemy-json_api.js

@@ -11,7 +11,7 @@ var structuredClone__default = /*#__PURE__*/_interopDefaultLegacy(structuredClon
 function deserialize(originalResponse) {
   var response = structuredClone__default["default"](originalResponse);
 
-  var included = response.included || [];
+  var included = response?.included || [];
 
   if (Array.isArray(response.data)) {
     return response.data.map(function (data) {

src/deserialize.js

@@ -6,7 +6,7 @@ export function deserialize(originalResponse, options = {}) {
     options = {}
   }
 
-  const included = response.included || []
+  const included = response?.included || []
 
   if (Array.isArray(response.data)) {
     return response.data.map((data) => {