Bump dompurify from 3.2.3 to 3.2.4 in /docs/slides

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 3.2.3 to 3.2.4.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](cure53/DOMPurify@3.2.3...3.2.4)

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

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

Author: dependabot[bot]