[BUG] Issues with rwth-aachen repository

**Describe the bug**
After adding the rwth-aachen repository (from https://app.rwth-aachen.de/fdroid/repo/), syncing the repository fails with the following error:

**Could not sync app.rwth-aachen.de/fdroid/repo**
Invalid server response

The repository works perfectly fine using the official F-Droid client.

**To Reproduce**
Steps to reproduce the behavior:
1. Open https://app.rwth-aachen.de/fdroid/repo/ in a web browser.
2. Copy the repository link which includes the fingerprint (https://app.rwth-aachen.de/app/fdroid/repo/?fingerprint=ACD7C554DED6B9A80BF43F7D766EE75C07DEBB89E83AB55799B94234AC05044C).
3. Select "Add repository" in Droid-ify.
4. Address and Fingerprint are autofilled from the clipboard.
5. Press "Save".
6. Sync F-Droid repositories using the button in the top right on the main screen.
7. Receive a notification with the aforementioned error.

**Expected behavior**
I expect the repository to sync normally, and to be able to download the RWTHapp from it.

**Screenshots**
Notification:
Repository in Droid-ify:
Repository in the official F-Droid app:

**Smartphone (please complete the following information):**
- Device: Pixel 6
- OS: Android 14
- Version v0.6.3

**Additional context**
I can (mostly) replicate this issue with a fresh install of the debug version of Droid-ify on my Android 12 Galaxy S10. The only difference is that I don't get any notifications on my S10, it just silently fails. The "console output" of the debug app doesn't show anything unusual from what I can see.