Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- `app/serializers/rest/account_serializer.rb`:
  Upstream added code too close to glitch-soc-specific followers-hiding code.
  Ported upstream changes.

app/workers/scheduler/scheduled_statuses_scheduler.rb

@@ -34,7 +34,7 @@ class Scheduler::ScheduledStatusesScheduler
   end
 
   def unpublish_expired_announcements!
-    expired_announcements.in_batches.update_all(published: false)
+    expired_announcements.in_batches.update_all(published: false, scheduled_at: nil)
   end
 
   def expired_announcements