fix(consumer): use correct generator signature

packages/consumer/mod.ts

···
   /**
    * Asynchronously iterate through items in the user's PDS
    */
-  async *listItems(): AsyncIterator<
+  async *listItems(): AsyncGenerator<
     DecryptedItem,
     void,
     undefined
···
         );
       }
 
-      if (res.data.cursor) cursor = res.data.cursor;
+      cursor = res.data.cursor;
 
       for (const record of res.data.records) {
         const item = parse(AppCisternLexiconItem.mainSchema, record.value);
···
    * Subscribes to the Jetstreams for the user's items. Pass `"stop"` into `subscription.next(...)` to cancel
    * @todo Allow specifying Jetstream endpoint
    */
-  async *subscribeToItems(): AsyncIterator<
+  async *subscribeToItems(): AsyncGenerator<
     DecryptedItem,
     void,
     "stop" | undefined