Too many parallel downloads

### ⚠️ 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

1. Have a folder with many large files on a server.
2. Try to sync the whole folder. Does not matter if I select the folder, or select all the files in it.
3. Nextcloud Android app tries to download everything at once. Like random four of the files make it through, the rest times out.

### Expected behaviour

The Nextcloud client should download the files one by one, queuing the rest. No more than two or three files shall be downloaded at once.

### Actual behaviour

The Nextcloud client starts all the downloads at once.

### Android version

15

### Device brand and model

Samsung Galaxy Tab S9 FE

### Stock or custom OS?

Stock

### Nextcloud android app version

3.34.0

### Nextcloud server version

32.0.0

### Using a reverse proxy?

Yes

### Android logs

_No response_

### Server error logs

```bash

```

### Additional information

The connections simply time out because it hits the limit of parallel connections on the server.