Bug Fixes
- Fix sending test notification to a group integration
- Fix the Login form to not perform form validation in GET requests
- Fix special character escaping in ntfy notifications
- Fix "Edit ntfy integration" page to fill the existing token in the form
- Fix "Delete Check" and "Update Check" API calls to handle concurrent deletes
- Fix Signal transport to handle JSON-RPC messages with no ids
- Fix DST handling in Check.get_grace_start()