Add changelog entry for Mattermost v6.6.1
- New version 6.6.1 of Mattermost has been installed.
- Add a changelog entry on hifis.net/doc.
The Helmholtz Codebase and Mattermost will not be available between May 2nd, 16:15 and May 2nd, 17:45. In preparation of the GitLab major upgrade 17.0 a database maintenance is required.
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