Prepare v0.53.2

[Zeitsperre]

Pull Request Checklist:

• [ ] This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes #xyz
• [ ] Tests for the changes have been added (for bug fixes / features)
  • [ ] (If applicable) Documentation has been added / updated (for bug fixes / features)
• [x] CHANGELOG.rst has been updated (with summary of main changes)
  • [x] Link to issue (:issue:number) and pull request (:pull:number) has been added

What kind of change does this PR introduce?

• Prepares the next release
• Simplifies the logic for the mastodon publishing workflow

Does this PR introduce a breaking change?

This release places a pin on xarray that renders it incompatible with version 24.10.0 due to a regression.