Saurik has officially pushed an upstate of Winterboard for iOS 9. According to the notes from Saurik:
Version 0.9.3919 is effectively just the smallest possible update for iOS 9.
As per the change log, this update also:
- Fix Calendar Icons (Surenix)
- Don’t Crash Spotlight Search
Head over to Cydia and refresh the repos and you will be able to receive the update. It will require a respring to take effect.