Release 2.8.0

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Reminder for next release: #2018 (reply in thread)

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Date for next release: April 30. Team: @areleu @stap-m

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Release postponed. Too many unfixed PRs open.

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I'd like to do the next release in the last week of may @madbkr @jh-RLI @ColinHDev @LillyG901

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1. All issues closed and all pull requests merged that are part of the release milestone.
2. Branch releases-v1.2.3 from dev.
3. Update version information and release date in VERSION file and CITATION.cff.
4. Change unreleased heading in CHANGELOG.md.
5. Create two pull requests.
6. Automated tests are successful.
7. PR reviews.
8. Merge both PRs.
9. Close release milestone.
10. Draft release.
11. Set as pre-release.
12. Press Publish release button.
13. Add build files to the release page.
14. Set as the latest release.
15. Create new unreleased section in CHANGELOG.md.
16. Inform @jh-RLI.

Detailled release workflow

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Release automation workflow successfully tested!