style: add workaround for incomplete channel mock typing

Author: madsroskar

package/src/components/ChannelList/hooks/listeners/__tests__/useChannelUpdated.test.tsx

@@ -18,7 +18,7 @@ describe('useChannelUpdated', () => {
           send_messages: true,
         },
       },
-    } as Channel;
+    } as unknown as Channel;
 
     const mockEvent = {
       channel: {