Bonnie Schulkin

Corrected typo in key for group members property

Update code for react-query v4

1

- update imports to `@tanstack/react-query` - update all [query keys to be arrays](https://tanstack.com/query/v4/docs/guides/migrating-to-react-query-4#query-keys-and-mutation-keys-need-to-be-an-array) - [install devtools separately](https://tanstack.com/query/v4/docs/devtools) and import from new package - for test QueryClient options, make [logger](https://tanstack.com/query/v4/docs/guides/migrating-to-react-query-4#setlogger-is-removed) and...

Please see https://www.udemy.com/course/learn-react-query/learn/lecture/42720400#content for a more complete explanation.