v7.0.4

Fixed

• Taskiq cron lock keys on the scheduler loop tick minute (via
  pending_ticks), not wall clock at send time, so an end-of-minute
  double-ready still singles-flights across pods.
• SchedulerComponent.ensure_cron_schedule registers crons with
  schedule_id == task_name, cleans legacy random-id rows, and replaces
  the cron expression when config changes.