chore(deps): bump dompurify from 3.0.11 to 3.1.6 in /site

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 3.0.11 to 3.1.6.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](cure53/DOMPurify@3.0.11...3.1.6)

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

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