HEAD request from SSO-authorized client app leads to Nextcloud app crash

### ⚠️ Before posting ⚠️

- [X] This is a **bug**, not a question or an enhancement.
- [X] I've [searched for similar issues](https://github.com/nextcloud/android/issues) and didn't find a duplicate.
- [X] I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
- [X] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/).

### Steps to reproduce

The following code which executed in client application leads to Nextcloud app crash when called
```Java
@Override
public boolean checkNewNotifications() throws Exception {
NextcloudRequest request = new NextcloudRequest.Builder().setMethod("HEAD")
.setUrl(Uri.encode("/ocs/v2.php/apps/notifications/api/v2/notifications", "/"))
.build();
Response response = API.performNetworkRequestV2(request);
String lastEtag = Objects.requireNonNull(response.getPlainHeader("ETag")).getValue();
Log.d(TAG, "lastETag=" + lastEtag);
Log.d(TAG, "mETag=" + mETag);
if(!lastEtag.equals(mETag)){
Log.d(TAG, "New notifications found");
mETag = lastEtag;
return true;
}
return false;
}
```
See the code [here](https://github.com/Andrewerr/NextcloudServices/blob/4e72dd7989d9f52dbe8749f366966480862550e9/app/src/main/java/com/polar/nextcloudservices/API/NextcloudSSOAPI.java#L172)
Note that changing request method to `GET` fixes error, though makes such requests energy-inefficient

### Expected behaviour

The HEAD request should properly work without throwing exception and/or crashing Nextcloud app

### Actual behaviour

The Nextcloud app crashes showing the following report

```
Exception in thread "ParcelFileDescriptor Transfer Thread" java.lang.NullPointerException
at java.io.SequenceInputStream.nextStream(SequenceInputStream.java:112)
at java.io.SequenceInputStream.read(SequenceInputStream.java:211)
at java.io.InputStream.read(InputStream.java:205)
at com.nextcloud.android.sso.aidl.ParcelFileDescriptorUtil$TransferThread.run(ParcelFileDescriptorUtil.java:76)
```

App information

ID: `com.nextcloud.client`

Version: `30260090`

Build flavor: `generic`

Device information

Brand: `OnePlus`

Device: `OnePlus7TProNR`

Model: `HD1925`

Id: `TQ3A.230901.001`

Product: `OnePlus7TProNR`

Firmware

SDK: `33`

Release: `13`

Incremental: `PolarMod-1.3-r1-hotdogg-20231016_145036-user`

### Android version

13

### Device brand and model

OnePlus 7T Pro 5G(hotdogg)

### Stock or custom OS?

Custom

### Nextcloud android app version

3.26.0(F-Droid)

### Nextcloud server version

27.1.3

### Using a reverse proxy?

Yes

### Android logs

[crash.log](https://github.com/nextcloud/android/files/13401128/crash.log)

### Server error logs

```bash
[Sat Nov 18 19:28:20.147789 2023] [core:error] [pid 27955:tid 140288571983552] [client 100.64.22.27:53598] AH00082: an unknown filter was not added: Deflate
[Sat Nov 18 19:28:20.367436 2023] [mpm_worker:error] [pid 25117:tid 140289272453184] AH00288: scoreboard is full, not at MaxRequestWorkers
[Sat Nov 18 19:28:20.445802 2023] [core:error] [pid 27675:tid 140287053657792] [client 100.64.22.27:53610] AH00082: an unknown filter was not added: Deflate
[Sat Nov 18 19:28:20.694604 2023] [core:error] [pid 27990:tid 140288991422144] [client 100.64.22.27:53612] AH00082: an unknown filter was not added: Deflate
[Sat Nov 18 19:28:21.068449 2023] [core:error] [pid 28025:tid 140289108854464] [client 100.64.22.27:53614] AH00082: an unknown filter was not added: Deflate
[Sat Nov 18 19:28:21.368670 2023] [mpm_worker:error] [pid 25117:tid 140289272453184] AH00288: scoreboard is full, not at MaxRequestWorkers
[Sat Nov 18 19:28:21.380971 2023] [core:error] [pid 28026:tid 140287993181888] [client 100.64.22.27:53618] AH00082: an unknown filter was not added: Deflate
[Sat Nov 18 19:28:21.814248 2023] [core:error] [pid 28094:tid 140287649244864] [client 100.64.22.27:53628] AH00082: an unknown filter was not added: Deflate
[Sat Nov 18 19:28:22.369872 2023] [mpm_worker:error] [pid 25117:tid 140289272453184] AH00288: scoreboard is full, not at MaxRequestWorkers
[Sat Nov 18 19:28:22.550135 2023] [core:error] [pid 28095:tid 140288253224640] [client 100.64.22.27:58026] AH00082: an unknown filter was not added: Deflate
[Sat Nov 18 19:28:23.371402 2023] [mpm_worker:error] [pid 25117:tid 140289272453184] AH00288: scoreboard is full, not at MaxRequestWorkers
[Sat Nov 18 19:28:24.372663 2023] [mpm_worker:error] [pid 25117:tid 140289272453184] AH00288: scoreboard is full, not at MaxRequestWorkers
[Sat Nov 18 19:28:25.373901 2023] [mpm_worker:error] [pid 25117:tid 140289272453184] AH00288: scoreboard is full, not at MaxRequestWorkers
[Sat Nov 18 19:28:26.379545 2023] [mpm_worker:error] [pid 25117:tid 140289272453184] AH00288: scoreboard is full, not at MaxRequestWorkers
[Sat Nov 18 19:28:27.380740 2023] [mpm_worker:error] [pid 25117:tid 140289272453184] AH00288: scoreboard is full, not at MaxRequestWorkers
[Sat Nov 18 19:28:28.381905 2023] [mpm_worker:error] [pid 25117:tid 140289272453184] AH00288: scoreboard is full, not at MaxRequestWorkers
[Sat Nov 18 19:28:28.855174 2023] [core:error] [pid 27710:tid 140288949458624] [client 100.64.22.1:60208] AH00082: an unknown filter was not added: Deflate
[Sat Nov 18 19:28:29.383183 2023] [mpm_worker:error] [pid 25117:tid 140289272453184] AH00288: scoreboard is full, not at MaxRequestWorkers
[Sat Nov 18 19:28:29.866286 2023] [core:error] [pid 28096:tid 140287540172480] [client 100.64.22.1:42815] AH00082: an unknown filter was not added: Deflate
```

### Additional information

* The ROM in use is [PolarMod](https://github.com/PolarMod) which is slightly customized LinageOS(hardened malloc, minor UI customizations and bootloader lock support)
* Logs are partially provided due to private information stored in them
* `HEAD` requests seem to work without SSO
* Server logs are in EET time, device logs are in CEST time
* The [issue](https://github.com/Andrewerr/NextcloudServices/issues/68) with more detailed logs from side of application is opened in repository of my application