Update to Mermaid v9.0.1

What does this MR do and why?

For: #359321 (closed), updates to v9.0.1 of Mermaid: https://github.com/mermaid-js/mermaid.

v9.0.0 of Mermaid is already available in GitLab Docs: gitlab-docs!2580 (merged).

v9.0.1 of Mermaid is also now available in GitLab Docs: gitlab-docs!2587 (merged).

CC @aqualls @sarahgerman @tlinz @mnichols1

Screenshots or screen recordings

Was able to do a Gitgraph diagram locally:

MR acceptance checklist

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