Pre-release fixes

[brynpickering]

EDIT: Since test.pypi failed we'll need to bump the version number. I'll do this in another PR. This PR is now just a collection of fixes.

Reviewer checklist:

• [ ] Documentation updated
• [ ] Version updated
• [ ] Test-PyPI run succeeds (and installing locally works: pip install --index-url https://test.pypi.org/simple/ --pre calliope
• [ ] Changelog updated

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (a5b83ba) 95.76% compared to head (d479834) 95.76%.

:exclamation: Current head d479834 differs from pull request most recent head e500288. Consider uploading reports for the commit e500288 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #550 +/- ## ======================================= Coverage 95.76% 95.76% ======================================= Files 24 24 Lines 3566 3566 Branches 777 711 -66 ======================================= Hits 3415 3415 Misses 86 86 Partials 65 65 ``` | [Files](https://app.codecov.io/gh/calliope-project/calliope/pull/550?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=calliope-project) | Coverage Δ | | |---|---|---| | [src/calliope/\_version.py](https://app.codecov.io/gh/calliope-project/calliope/pull/550?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=calliope-project#diff-c3JjL2NhbGxpb3BlL192ZXJzaW9uLnB5) | `100.00% <100.00%> (ø)` | |