npm(deps): bump dompurify from 3.4.5 to 3.4.9

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 3.4.5 to 3.4.9.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](cure53/DOMPurify@3.4.5...3.4.9)

---
updated-dependencies:
- dependency-name: dompurify
  dependency-version: 3.4.8
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]