Add mindmap support with Mermaid

auke-requested to merge
auke-/gitlab:feat-update-mermaid into master

What does this MR do and why?

Bumping mermaid to newest version (from 9.1.3 to 9.2.2). New minor version added support for mindmaps (see https://mermaid-js.github.io/mermaid/#/mindmap).

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