build(deps): bump mermaid and gatsby-remark-mermaid in /docs

Bumps [mermaid](https://github.com/mermaid-js/mermaid) to 11.3.0 and updates ancestor dependency [gatsby-remark-mermaid](https://github.com/remcohaszing/gatsby-remark-mermaid). These dependencies need to be updated together.


Updates `mermaid` from 8.14.0 to 11.3.0
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Changelog](https://github.com/mermaid-js/mermaid/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/mermaid-js/mermaid/compare/[email protected])

Updates `gatsby-remark-mermaid` from 2.1.0 to 5.0.0
- [Release notes](https://github.com/remcohaszing/gatsby-remark-mermaid/releases)
- [Commits](remcohaszing/gatsby-remark-mermaid@v2.1.0...v5.0.0)

---
updated-dependencies:
- dependency-name: mermaid
  dependency-type: indirect
- dependency-name: gatsby-remark-mermaid
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]