Firestore listeners seem to die when app is moved to background for too long

### Description

Our app is kind of an iPad based cash register that is only used during the day. During the night, the screen is locked but the devices stay on. On the next day some customers report outdated data that only refreshes once the app is restarted.
Similar problems have been reported on [StackOverflow](https://stackoverflow.com/questions/64196357/firestore-listener-killed-when-app-goes-in-background-for-a-long-time), for [Android](https://github.com/firebase/firebase-android-sdk/issues/2637) and [Flutter](https://github.com/firebase/flutterfire/issues/4305) so I assume that the same could be true for iOS.

### Reproducing the issue

The issue is currently hard to reproduce, as it only seems to happen after going to the background for a long time.

### Firebase SDK Version

9.6

### Xcode Version

14.2

### Installation Method

Swift Package Manager

### Firebase Product(s)

Firestore

### Targeted Platforms

iOS

### Relevant Log Output

_No response_

### If using Swift Package Manager, the project's Package.resolved

_No response_

### If using CocoaPods, the project's Podfile.lock

_No response_