Push notification receipt IDs will change string formats

The Expo push notification service uses receipts with unique IDs to confirm whether notifications were correctly received by underlying providers like APNs and FCM, or if there was an error. Traditionally, these receipt IDs were UUIDv4 strings, but starting April 8, there will be an experimental switch to UUIDv7 strings. This change is not expected to impact code that treats receipt IDs as opaque strings, but developers are being notified to avoid relying on undocumented details, such as assuming receipt IDs will always be UUIDv4 or even a UUID, with the only assurance being that they will remain as strings.

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