OSV mirroring hangs with Ubuntu enabled

### Current Behavior

With `Ubuntu` enabled, OSV mirroring hangs forever:

This issue showed up in DT v4.14.0.

### Steps to Reproduce

1. Enable OSV mirroring and enable the `Ubuntu` ecosystem
2. OsvDownloadTask will hang at `Processed 5449/54490 advisories (10%)` (or similar)

### Expected Behavior

Working OSV mirroring

### Dependency-Track Version

4.14.0

### Dependency-Track Distribution

Container Image

### Database Server

PostgreSQL

### Database Server Version

18.2

### Browser

Google Chrome

### Checklist

- [x] I have read and understand the [contributing guidelines](https://github.com/DependencyTrack/dependency-track/blob/master/CONTRIBUTING.md#filing-issues)
- [x] I have checked the [existing issues](https://github.com/DependencyTrack/dependency-track/issues) for whether this defect was already reported