GHSL-2024-288: SickChill open redirect in login

SickChill is an automatic video library manager for TV shows. A user-controlled `login` endpoint's `next_` parameter takes arbitrary content. Prior to commit c7128a8946c3701df95c285810eb75b2de18bf82, an authenticated attacker may use this to redirect the user to arbitrary destinations, leading to open redirect. Commit c7128a8946c3701df95c285810eb75b2de18bf82 changes the login page to redirect to `settings.DEFAULT_PAGE` instead of to the `next` parameter.