Update mermaid to version 11.0.0.0+

Implementation guide

From comment below:

In that vein, should you want to submit a PR, you can take a look at Update mermaid to fix upstream render bug (!143609 - merged), which upgraded the support. Just at that level it's pretty simple, though maybe there is some additional testing we would want to do with a version major version jump. But in general, there shouldn't be much that needs to be changed in the code. 🤞