How do I migrate my database to a newer version? (source)

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  * MariaDB 10.6 to 10.11
  * MySQL 8.0 to 8.4

I currently upgaded all instances to a new database version, using the Admin panel ((/Doc/English/Backup backup and restore mechanism)). As this affects all WackoWiki users sooner or later, we should perhaps share our HowTo's. The SSH as well the phpMyAdmin part might be differ slightly from provider to provider.