Custom filter update fails after redirecting filter URL

### Please answer the following questions for yourself before submitting an issue

- [x] Filters were updated before reproducing an issue
- [x] I checked the [knowledge base](https://adguard.com/kb/) and found no answer
- [x] I checked to make sure that this issue has not already been filed

### AdGuard Extension version

5.4.3.55

### Browser version

Google Chrome

### OS version

Windows 11

### Ad Blocking

AdGuard Base filter

### Privacy

_No response_

### Social

_No response_

### Annoyances

_No response_

### Security

_No response_

### Other

_No response_

### Language-specific

_No response_

### What Tracking protection options do you have enabled?

_No response_

### Issue Details

Steps to reproduce:
1. Create a GitHub repository with a filter list file.
2. Subscribe to the filter list in AdGuard.
3. Rename repository in GitHub.
4. Open "Filters" in extension dashboard
5. Hit "Check for updates"

### Expected Behavior

The filter list should update, as the old filter URL automatically redirects to the new repository.

### Actual Behavior

Migrated filters are stuck on previous updated date. They do not follow the redirect.

### Screenshots

Screenshot 1

### Additional Information

I maintain [Stevo's AI Blocklist](https://github.com/Stevoisiak/Stevos-AI-Blocklist), recently renamed from Stevo's GenAI Blocklist. The old filter URL, [`https://raw.githubusercontent.com/Stevoisiak/Stevos-GenAI-Blocklist/refs/heads/main/GenAI-Blocklist.txt`](https://raw.githubusercontent.com/Stevoisiak/Stevos-GenAI-Blocklist/refs/heads/main/GenAI-Blocklist.txt), now redirects to [`https://raw.githubusercontent.com/Stevoisiak/Stevos-AI-Blocklist/refs/heads/main/GenAI-Blocklist.txt`](https://raw.githubusercontent.com/Stevoisiak/Stevos-AI-Blocklist/refs/heads/main/GenAI-Blocklist.txt).

In uBlock Origin, the rename caused no issues. The filter list continued updating from the new, redirected URL. However, in AdGuard, the updates now appear to no longer work.