Bump dompurify from 1.0.4 to 1.0.9

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 1.0.4 to 1.0.9.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](https://github.com/cure53/DOMPurify/compare/1.0.4...1.0.9

)

Signed-off-by: dependabot[bot] <support@dependabot.com>
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>