Release v0.7.0.dev3

[brynpickering]

Reviewer checklist:

• [x] Version updated
• [x] Changelog updated
• [x] Test-PyPI run succeeds (and installing locally works: pip install -i https://test.pypi.org/simple/ --extra-index-ur l https://pypi.org/simple calliope==0.7.0.dev3)

[codecov[bot]]

Codecov Report

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

Comparison is base (b5cdf12) 95.85% compared to head (b155f43) 95.85%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #570 +/- ## ======================================= Coverage 95.85% 95.85% ======================================= Files 24 24 Lines 3619 3619 Branches 788 722 -66 ======================================= Hits 3469 3469 Misses 86 86 Partials 64 64 ``` | [Files](https://app.codecov.io/gh/calliope-project/calliope/pull/570?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/570?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)` | |