Release 2.6.0

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Release planned for 2024-12-02. Team tbd

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As additional task for this release: check if automation workflow from PR #1956 works
FYI @ColinHDev

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From PR #1956

Maybe for the next release you could do a "vX.X.X-pre" release to test this workflow

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ToDo in/after release: update release workflow with repect to #1956

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Release team: @stap-m @Ludee @NormanZielke @madbkr (partially: @LillyG901 @ColinHDev )

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Update: Release was postponed to 2024-12-06. Team: @madbkr @ColinHDev @stap-m

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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. This time: Pre-release and workflow testing
12. Set as the latest release.
13. Press Publish release button.
14. Create new unreleased section in CHANGELOG.md.
15. Add build files to the release page -- automatically
16. Inform @adelmemariani and @jh-RLI.

Detailled release workflow

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ToDos:

• Update of the release workflow script (attachment of files AFTER creation of files, automated publication should not remove description from draft, set as latest release) @ColinHDev
• Update of the release wiki page @madbkr @ColinHDev

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Unreleased section is part of #1976

[jh-RLI]

I updated the oeo release and used the script to update the oeo-viewer data also. I hope it now includes the data. Please check and let me know.
Note: Your browser cache might need to be deleted, otherwise it will still show version 2.5.0
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