[Bug] Firestore crash when using Android emulator

### [REQUIRED] Please fill in the following fields:

* Unity editor version: 2020.3.9f1
* Firebase Unity SDK version: 7.2.0
* Source you installed the SDK: Unity Package Manager with tgz
* Problematic Firebase Component: Firestore
* Other Firebase Components in use: Auth, Crashlytics, Remote Config
* Additional SDKs you are using:
* Platform you are using the Unity editor on: Windows
* Platform you are targeting: Android
* Scripting Runtime: IL2CPP

### [REQUIRED] Please describe the issue here:

```
E/AndroidRuntime( 5020): FATAL EXCEPTION: main
E/AndroidRuntime( 5020): Process: com.example.game, PID: 5020
E/AndroidRuntime( 5020): java.lang.Error: FATAL EXCEPTION [main]
E/AndroidRuntime( 5020): Unity version : 2020.3.9f1
E/AndroidRuntime( 5020): Device model : samsung SM-G955N
E/AndroidRuntime( 5020): Device fingerprint: samsung/SM-G955N/dream2lteks:5.1.1/NRD90M/500200305:user/release-keys
E/AndroidRuntime( 5020): Build Type : Release
E/AndroidRuntime( 5020): Scripting Backend : IL2CPP
E/AndroidRuntime( 5020): ABI : armeabi-v7a
E/AndroidRuntime( 5020): Strip Engine Code : true

E/AndroidRuntime( 5020): Caused by: java.lang.RuntimeException: Internal error in Cloud Firestore (22.1.2).

E/AndroidRuntime( 5020): at com.google.firebase.firestore.util.AsyncQueue.lambda$panic$3(AsyncQueue.java:534)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.util.AsyncQueue$$Lambda$3.run(AsyncQueue.java)
E/AndroidRuntime( 5020): at android.os.Handler.handleCallback(Handler.java:739)
E/AndroidRuntime( 5020): at android.os.Handler.dispatchMessage(Handler.java:95)
E/AndroidRuntime( 5020): at android.os.Looper.loop(Looper.java:135)
E/AndroidRuntime( 5020): at android.app.ActivityThread.main(ActivityThread.java:5307)
E/AndroidRuntime( 5020): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 5020): at java.lang.reflect.Method.invoke(Method.java:372)
E/AndroidRuntime( 5020): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
E/AndroidRuntime( 5020): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
E/AndroidRuntime( 5020): Caused by: java.lang.IllegalArgumentException: Timestamp seconds out of range: 6967862201976803777
E/AndroidRuntime( 5020): at com.google.firebase.firestore.util.Preconditions.checkArgument(Preconditions.java:117)
E/AndroidRuntime( 5020): at com.google.firebase.Timestamp.validateRange(Timestamp.java:159)
E/AndroidRuntime( 5020): at com.google.firebase.Timestamp.(Timestamp.java:63)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.remote.RemoteSerializer.decodeTimestamp(RemoteSerializer.java:110)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.remote.RemoteSerializer.decodeVersion(RemoteSerializer.java:121)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.remote.RemoteSerializer.decodeWatchChange(RemoteSerializer.java:873)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.remote.WatchStream.onNext(WatchStream.java:106)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.remote.WatchStream.onNext(WatchStream.java:38)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.remote.AbstractStream$StreamObserver.lambda$onNext$1(AbstractStream.java:119)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.remote.AbstractStream$StreamObserver$$Lambda$2.run(AbstractStream.java)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.remote.AbstractStream$CloseGuardedRunner.run(AbstractStream.java:67)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.remote.AbstractStream$StreamObserver.onNext(AbstractStream.java:110)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.remote.FirestoreChannel$1.onMessage(FirestoreChannel.java:125)
E/AndroidRuntime( 5020): at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable.runInternal(ClientCallImpl.java:658)
E/AndroidRuntime( 5020): at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable.runInContext(ClientCallImpl.java:643)
E/AndroidRuntime( 5020): at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
E/AndroidRuntime( 5020): at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
E/AndroidRuntime( 5020): at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
E/AndroidRuntime( 5020): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
E/AndroidRuntime( 5020): at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:152)
E/AndroidRuntime( 5020): at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:265)
E/AndroidRuntime( 5020): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
E/AndroidRuntime( 5020): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
E/AndroidRuntime( 5020): at com.google.firebase.firestore.util.AsyncQueue$SynchronizedShutdownAwareExecutor$DelayedStartFactory.run(AsyncQueue.java:229)
E/AndroidRuntime( 5020): at java.lang.Thread.run(Thread.java:818)
W/ActivityManager( 1779): Force finishing activity 1 com.example.game/com.google.firebase.MessagingUnityPlayerActivity
```

#### Steps to reproduce:

#### Relevant Code:

Start by reproducing the crash on Android with Unity 2020.3.9f1, Firebase Unity SDK 7.2.0, IL2CPP, and Firestore enabled, then inspect the stack trace through MessagingUnityPlayerActivity and Firestore's WatchStream. Done means the Android emulator no longer terminates with the out-of-range Timestamp error.

Written by the indexing model from the issue text.