Bump dompurify and mermaid

Bumps [dompurify](https://github.com/cure53/DOMPurify) and [mermaid](https://github.com/mermaid-js/mermaid). These dependencies needed to be updated together.

Updates `dompurify` from 3.1.6 to 3.2.4
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](cure53/DOMPurify@3.1.6...3.2.4)

Updates `mermaid` from 11.4.0 to 11.4.1
- [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/mermaid@11.4.0...mermaid@11.4.1)

---
updated-dependencies:
- dependency-name: dompurify
  dependency-type: indirect
- dependency-name: mermaid
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]