Bug Fixes
- Add fixtures for join requests
([91](https://github.com/ocadotechnology/codeforlife-package-python/pull/91),
[`a705367`](https://github.com/ocadotechnology/codeforlife-package-python/commit/a705367edfc148973b89ce65ea83ec3ba65ed12c))
* Update fixtures for class join requests
* Merge branch 'main' into join_requests
* Update fixtures
* Remove unnecessary serializer field
* Remove unnecessary fixture
* Black