SyntaxWarning: 'return' in a 'finally' block

Running `journal-brief` with Python 3.14 logs a `SyntaxWarning` every time, which is a bit distracting:

```
$ uvx journal-brief
/home/rixx/.cache/uv/archive-v0/PShQzAMqaAQ_A1_EPx0lA/lib/python3.14/site-packages/journal_brief/config.py:408: SyntaxWarning: 'return' in a 'finally' block
  return valid
```