Retrieve updated timezone definitions (tzurl / ical4j) via HTTPS

### ⚠️ 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

Using the client in a 'normal' way

### Expected behaviour

client should connect to my nextcloud instance

### Actual behaviour

client connects to other servers

### Android version

12

### Device brand and model

cat s52

### Stock or custom OS?

Stock

### Nextcloud android app version

3.23.0

### Nextcloud server version

24

### Using a reverse proxy?

I don't know

### Android logs

_No response_

### Server error logs

_No response_

### Additional information

_No response_