feat(storage-uploadthing)!: upgrade to v7 (#8346)

Upgrade uploadthing to v7

The `options` that can be passed to the plugin now mirror the
`UTApiOptions` of v7.

The most notable change is to pass `token` with
`process.env.UPLOADTHING_TOKEN` instead of `apiKey` with
`process.env.UPLOADTHING_SECRET`.

```diff
options: {
- apiKey: process.env.UPLOADTHING_SECRET,
+ token: process.env.UPLOADTHING_TOKEN,
  acl: 'public-read',
},

packages/storage-uploadthing/README.md

@@ -23,7 +23,7 @@ export default buildConfig({
         [mediaSlug]: true,
       },
       options: {
-        apiKey: process.env.UPLOADTHING_SECRET,
+        token: process.env.UPLOADTHING_TOKEN,
         acl: 'public-read',
       },
     }),

packages/storage-uploadthing/package.json

@@ -42,7 +42,7 @@
   },
   "dependencies": {
     "@payloadcms/plugin-cloud-storage": "workspace:*",
-    "uploadthing": "^6.10.1"
+    "uploadthing": "7.3.0"
   },
   "devDependencies": {
     "payload": "workspace:*"