unsplash-js update for version 6.0 (#40908)

* Update for unsplash API 6.0

* Update tests for unsplash-js 6.0

types/unsplash-js/index.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for unsplash-js 5.0
+// Type definitions for unsplash-js 6.0
 // Project: https://github.com/unsplash/unsplash-js#readme
 // Definitions by: Andrew Malikov <https://github.com/markupcode>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -17,7 +17,7 @@ export default class Unsplash {
     constructor(options: {
         apiUrl?: string;
         apiVersion?: string;
-        applicationId: string;
+        accessKey: string;
         secret: string;
         callbackUrl?: string;
         bearerToken?: string;

types/unsplash-js/unsplash-js-tests.ts

@@ -1,7 +1,7 @@
 import Unsplash, { toJson } from "unsplash-js";
 
 const unsplash = new Unsplash({
-    applicationId: "{APP_ACCESS_KEY}",
+    accessKey: "{APP_ACCESS_KEY}",
     secret: "{APP_SECRET}"
 });