Contributors script sometimes adds @unknown to the thank-you section.
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Current evaluation
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Issue body
The contributors script adds the user called unknown to the thank-you section when it cannot retrieve the actual username of a contributor.
I ran:
```terminal
python /home/lengau/Work/Code/starflow/tools/contributors.py --project=charmcraft --old-ref=4.1.0 --new-ref=3b6de4ae53dd8342f4f82797017882728b7763a2
```
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