Backup fails with "GCM cipher cannot be reused for encryption" on large apps when encryption is enabled

### Please check before submitting an issue

- [x] I know what my device, OS and App Manager versions are
- [x] I know how to take logs
- [x] I know that generating a report, in whole part or in part, using AI/LLM is prohibited
- [x] I know how to reproduce the issue which may not be specific to my device

### Describe the bug

When attempting to back up a very large application (specifically, obb, the game Injustice, package `com.wb.goog.injustice`) with backup encryption enabled, the backup process fails. The log shows an `IllegalStateException: GCM cipher cannot be reused for encryption`. This only happens with this specific large app; other smaller apps back up successfully with encryption enabled.

### To Reproduce

1. Enable backup AES encryption in App Manager.
2. Select a very large application/game for backup (e.g., Injustice - `com.wb.goog.injustice`).
3. Start the backup process.

### Expected behavior

The application should be backed up and encrypted successfully without throwing a cipher reuse exception, regardless of the app's large size.

### Screenshots

_No response_

### Logs

====> op=BACKUP_RESTORE, mode=BACKUP pkg=(com.wb.goog.injustice, 0)
io.github.muntashirakon.AppManager.backup.BackupException: Unknown error occurred.
at io.github.muntashirakon.AppManager.backup.BackupOp.runBackup(BackupOp.java:228)
at io.github.muntashirakon.AppManager.backup.BackupManager.backup(BackupManager.java:105)
at io.github.muntashirakon.AppManager.batchops.BatchOpsManager.lambda$backup$1$io-github-muntashirakon-AppManager-batchops-BatchOpsManager(BatchOpsManager.java:353)
at io.github.muntashirakon.AppManager.batchops.BatchOpsManager$$ExternalSyntheticLambda1.run(D8$$SyntheticClass:0)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:487)
at java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
at java.lang.Thread.run(Thread.java:1012)
Caused by: java.lang.IllegalStateException: GCM cipher cannot be reused for encryption
at org.bouncycastle.crypto.modes.GCMBlockCipher.checkStatus(Unknown Source:12)
at org.bouncycastle.crypto.modes.GCMBlockCipher.processBytes(Unknown Source:0)
at org.bouncycastle.crypto.io.CipherOutputStream.write(Unknown Source:38)
at android.os.FileUtils.copyInternalUserspace(FileUtils.java:692)
at android.os.FileUtils.copy(FileUtils.java:410)
at io.github.muntashirakon.io.IoUtils$$ExternalSyntheticApiModelOutline0.m(D8$$SyntheticClass:0)
at io.github.muntashirakon.io.IoUtils.copy(IoUtils.java:101)
at io.github.muntashirakon.io.IoUtils.copy(IoUtils.java:88)
at io.github.muntashirakon.AppManager.crypto.AESCrypto.handleFiles(AESCrypto.java:190)
at io.github.muntashirakon.AppManager.crypto.AESCrypto.encrypt(AESCrypto.java:127)
at io.github.muntashirakon.AppManager.backup.BackupOp.encrypt(BackupOp.java:521)
at io.github.muntashirakon.AppManager.backup.BackupOp.backupData(BackupOp.java:310)
at io.github.muntashirakon.AppManager.backup.BackupOp.runBackup(BackupOp.java:179)
... 8 more
Suppressed: org.bouncycastle.crypto.io.CipherIOException: Error closing stream:
at org.bouncycastle.crypto.io.CipherOutputStream.close(Unknown Source:59)
at io.github.muntashirakon.AppManager.crypto.AESCrypto.handleFiles(AESCrypto.java:189)
... 12 more
Caused by: java.lang.IllegalStateException: GCM cipher cannot be reused for encryption
at org.bouncycastle.crypto.modes.GCMBlockCipher.checkStatus(Unknown Source:12)
at org.bouncycastle.crypto.modes.GCMBlockCipher.doFinal(Unknown Source:0)
at org.bouncycastle.crypto.io.CipherOutputStream.close(Unknown Source:31)
... 13 more

### Device info

- Device: Xiaomi A2 Lite
- OS Version: Android 14 (LineageOS 21)
- App Manager Version: 4.0.5
- Mode: Root (APatch)

### Additional context

note that this app includes OBB files, and its total backup size should be approximately 1.7gb